Kennel Cough in Puppies: Symptoms, Vet Triggers, Treatment

Last reviewed · 14 May 2026 · Sources linked throughout

If your puppy is coughing, you’re already doing the right thing by reading this carefully. Puppies are not little adults. Kennel cough progresses faster in puppies than in mature dogs because of smaller airway diameter, lower respiratory reserve, and an immune system that is still maturing through the first sixteen weeks of life[4][5]. The threshold for picking up the phone to your vet is much lower than it would be for an adult dog, and in many age bands it is “today, not tomorrow”. This guide walks you through exactly what to look for, when home care is appropriate, when it isn’t, and how to think about the Bordetella vaccine for a puppy in the middle of the critical 6–16 week window.

Why Puppies Are at Much Higher Risk

The single most important thing to understand about kennel cough in puppies is that the immune defences that protect an adult dog from rapid deterioration simply are not fully online yet. In the first eight to sixteen weeks of life, your puppy is relying on a fading store of antibodies transferred through colostrum from the mother (maternally derived antibodies, or MDA) while their own immune system is still learning how to mount a primary response to vaccines and pathogens[4][5][6].

This is the “window of vulnerability” that veterinary immunologists describe: maternal antibodies are still high enough to neutralise the antigens in a vaccine before the puppy’s immune system can respond to them, but they are dropping fast enough that they no longer fully protect against natural infection. Research tracking parvovirus-specific maternal antibody titres in puppies from a single breeding kennel found substantial individual variation in how long that protection lasted, with some puppies losing protection by eight weeks while littermates were still protected at twelve[2]. The same heterogeneity applies to Bordetella exposure — which is why a single early vaccination cannot be assumed to have “taken”.

Anatomically, puppies are also disadvantaged. Their airways are smaller in absolute diameter than an adult dog’s, so any swelling or inflammation produces proportionally more obstruction. Their respiratory reserve — the amount of spare ventilatory capacity available to compensate when something goes wrong — is lower. The result is that the same volume of mucus that an adult dog might cough up without distress can compromise oxygen exchange in a puppy[4][5].

Thermoregulation is immature too. Puppies struggle to maintain stable body temperature when systemically unwell, and the metabolic cost of fever is harder to compensate for when the puppy’s energy reserves are smaller[4]. Add in the fact that this is exactly the age band when first-time puppy parents are encouraged to take their puppy to socialisation classes, the groomer, the vet for second vaccinations, and the breeder for collection — all environments where infectious respiratory pathogens spread — and you have a perfect storm: maximum exposure, minimum defence.

For Bordetella bronchiseptica specifically, maternal antibodies in the bloodstream do not translate well into mucosal protection at the respiratory epithelium, which is where the bacterium actually colonises. So even a puppy whose mother had robust Bordetella immunity may not have inherited useful protection against respiratory infection — one of the reasons that mucosal (intranasal or oral) Bordetella vaccination is recommended from six to eight weeks of age in higher-exposure puppies[1][11][16].

Age-by-Age Guidance — From 6 Weeks to 12 Months

The right response to a coughing puppy depends heavily on age. The sections below give you a working framework, but they do not replace a phone call to your vet — especially in the younger age bands.

What if my puppy under 6 weeks is coughing?

Vet immediately, every time. Puppies under six weeks possess virtually no capability for independent immune response and are still wholly dependent on maternal antibodies for protection[4][5][6]. The innate immune system is functional but reduced — inflammatory responses are weaker and local mucosal immunity is limited. Sepsis is the leading cause of death in canine neonates[37]. Any cough at this age should be assumed to indicate something more serious than uncomplicated kennel cough until proven otherwise. Home management is not appropriate, full stop.

What about 6 to 12 weeks?

This is when active vaccination protocols begin, and also when the first Bordetella vaccinations are typically given (intranasal or oral from six weeks; oral from eight weeks)[1][11][13][16]. A cough that appears within three to seven days of an intranasal Bordetella vaccine, in a puppy who is otherwise eating, playing and showing no fever, may represent a mild post-vaccine reaction rather than disease — but you cannot reliably distinguish this from early infection without veterinary assessment[1][16]. Our default at this age is vet on day one of any cough. The diagnostic uncertainty is too high to take the chance, and the consequences of missing an early pneumonia are severe.

What about 12 to 16 weeks?

This is the peak risk window for kennel cough in puppies and the one we most want first-time puppy parents to understand. Three things converge: maternal antibodies have substantially waned in most puppies, a single Bordetella vaccination may not yet have generated complete active immunity, and this is exactly the age when puppy socialisation classes and the wider world of dog-to-dog contact begin[4][5][13][24]. A booster Bordetella vaccination at ten to twelve weeks — after further decline of maternal antibodies — produces stronger immune responses than a single early dose in many puppies[1][11]. In this age band, any cough warrants veterinary evaluation; distinguishing uncomplicated kennel cough from early pneumonia on clinical grounds alone is frequently impossible, and the puppy’s airway anatomy makes rapid progression more likely than in an adult[67].

What about 16 to 24 weeks (4 to 6 months)?

By sixteen weeks, most puppies have completed the primary vaccination series and have functional active immunity to Bordetella and other core pathogens, assuming the series has been administered correctly[13][20][24]. Risk profiles are improving, but the larynx, trachea and bronchial tree are still developing, so inflammation still produces proportionally more airway obstruction than in an adult. A puppy in this band with a mild dry cough who is otherwise completely well (eating, playing, no fever, normal resting respiratory rate) can sometimes be managed with close home observation and a low-threshold call to the vet — but if symptoms last more than a few days, or any systemic signs appear, escalate.

What about 6 to 12 months?

By six months, most puppies have immune competence approaching that of an adult and can be managed much more like an adult with kennel cough[4][5][24]. Immunological maturity continues to develop through the first year, and the airways of large and giant breed puppies keep growing for longer still. If your six to twelve month old puppy has a mild, dry, self-limiting cough without systemic signs, you can reasonably follow the standard adult home-care framework while keeping a low threshold for a vet check. Persistent cough beyond three weeks, fever, lethargy, or any respiratory distress still warrants prompt assessment.

Symptoms in Puppies — What’s Different from Adults

The hallmark kennel cough sign — a harsh, paroxysmal “goose-honking” or “seal-barking” cough — is the same in puppies as in adults[67]. The difference is what surrounds the cough. In an adult dog with uncomplicated kennel cough, the cough is usually the dominant or only sign; the dog remains bright, eating normally, and behaviourally itself. In a puppy, the cough is much more likely to come with systemic features, and those features appear earlier in the disease course than they would in a mature animal[4][5].

Lethargy is a more prominent sign in puppies than in adults and should always be taken seriously[4][5]. A puppy who has been knocked off their usual pattern of play, exploration and zoomies is not “just being calm” — that is a clinical sign. Reduced suckling in very young litters, or reduced interest in food in older puppies, is another early warning that points away from uncomplicated kennel cough and towards systemic illness[4][5].

Check the gums. Healthy puppy gums are pink, moist and capillary refill (press a finger pad against the gum, lift it, and count how long it takes for the pink to return) is under two seconds. Pale, grey, or blue-tinged gums in a coughing puppy are an oxygen-delivery emergency — this is a same-hour vet trip, not a same-day one.

Fever — a rectal temperature of 39.5°C (103.1°F) or above, against a normal range of 38.3–39.2°C — carries more weight in a puppy than in an adult because puppies have less metabolic reserve to compensate for the energy cost of fever. A single high reading is informative, but trends matter more than single numbers, so repeat the reading after twenty minutes if you’re unsure.

Respiratory rate at rest is one of the most useful signs you can monitor at home. A relaxed, sleeping puppy normally breathes at up to about 30 breaths per minute. A resting rate that stays above 30, or rises more than about 20% above your puppy’s usual, is a reason to call your vet. Breathing that involves the belly muscles or visible flank movement, or any open-mouth breathing at rest, is a sign of lower-airway involvement and requires urgent veterinary attention at any rate[67].

If you have a brachycephalic puppy — French bulldog, English bulldog, pug, Boston terrier, Pekingese, shih tzu — treat every respiratory sign more urgently. Their anatomically narrower airways mean that the same inflammation produces proportionally more obstruction, and the threshold to vet is lower again than for a non-brachycephalic puppy of the same age[4][5].

A productive cough — one that brings up mucus, foam or anything wet-sounding — means secondary bacterial infection has likely established on the damaged respiratory epithelium and the disease has moved beyond simple viral tracheobronchitis[67]. This is a same-day vet appointment in any puppy.

The Bordetella Vaccine for Puppies — What You Need to Know

Three vaccine formulations are available for puppies: intranasal attenuated live vaccine instilled into both nostrils, oral attenuated live vaccine given by mouth, and injectable inactivated vaccine. For puppies specifically, the intranasal and oral formulations are preferred because they build mucosal immunity directly at the respiratory epithelium — which is the tissue Bordetella bronchiseptica actually colonises[1][11][16]. The injectable form produces systemic antibody responses but does not establish the same local protection.

Onset of immunity from mucosal vaccines is impressively fast. A controlled challenge study comparing intranasal and oral Bordetella vaccines in approximately eight-week-old beagle puppies found that vaccinated puppies were fully protected against virulent Bordetella challenge by seven days post-vaccination, while eight of nine unvaccinated controls developed spontaneous cough[16]. That seven-day onset is one of the strongest reasons to prefer mucosal vaccination in the puppy situation, where exposure risk often arrives quickly.

The 2022 AAHA Canine Vaccination Guidelines classify Bordetella as non-core — a position we have checked against the 2022 guidelines themselves. The 2024 update is behind a paywall and we have not verified it directly. Vaccination from six to eight weeks of age is recommended in puppies with planned exposure to boarding kennels, daycare, socialisation classes, shelters or breeders[20]. Oral vaccines are typically held until eight weeks because the more acidic gastric environment in very young puppies can destabilise the vaccine[13][14].

Maternal antibody interference is the single most important thing to understand about Bordetella vaccination in puppies. When a puppy receives a vaccine while circulating maternal antibodies are still present, the maternal IgG binds to the vaccine antigens and neutralises them before the puppy’s own immune system can respond — no immune memory forms, and the puppy is effectively unprotected despite having “had its vaccine”[4][5][6]. Maternal antibody titres decline gradually and unpredictably across the puppy population. The same vaccine given to littermates on the same day will protect some and be neutralised in others. This is why both the AAHA 2022 and the WSAVA 2024 vaccination guidelines call for a repeated puppy schedule rather than a single early dose — initial vaccination at six to eight weeks, then every two to four weeks until sixteen weeks of age or older — so that repeated doses catch each puppy as its own maternal antibodies finally fall below the neutralising threshold[4][5][20][24][49].

A mild, dry post-vaccine cough is a known phenomenon. After intranasal Bordetella vaccination, some puppies develop a mild cough, sometimes with mild nasal discharge, within three to seven days — this represents the mucosal immune response activating against the attenuated live vaccine organisms and typically resolves on its own within a week[1][11][16]. The distinguishing features of a post-vaccine reaction versus real disease are: post-vaccine cough is mild, the puppy is otherwise completely well (eating, playing, no fever), and the cough is short-lived. If you see fever, lethargy, reduced appetite, productive cough, fast breathing, or a cough that persists beyond seven days, that is not a vaccine reaction — that is illness, and your puppy needs to be seen.

For the deeper dive on Bordetella vaccine specifics — how it works, what the schedule looks like across the full adult life, why injectable forms exist alongside the mucosal forms — read our companion piece on the Bordetella vaccine. For now, the puppy-specific message is simple: mucosal vaccines from 6–8 weeks, a booster at 10–12 weeks to catch waning MDA, and don’t assume a single dose has fully “taken”.

Pneumonia Progression — The Headline Danger

Pneumonia is the worst-case outcome of kennel cough in puppies and the single most important reason that the vet threshold is lower at this age than at any other. Pneumonia is the leading infectious cause of morbidity and mortality in young dogs[67], and the reason it is so much more dangerous in puppies than in adults is mechanical, not just immunological. Smaller airway diameter means the same inflammation produces proportionally larger obstruction. Lower respiratory reserve means the puppy cannot increase minute ventilation as effectively to compensate for ventilation-perfusion mismatch. So when alveolar consolidation does start, decompensation from comfortable breathing to severe hypoxia happens faster than it would in an adult with comparable lung pathology[4][5].

The pathophysiology is worth understanding because it explains why time matters. The primary kennel cough pathogens — canine parainfluenza virus, canine adenovirus-2, Bordetella bronchiseptica (when bacterial), canine herpesvirus — damage the ciliated respiratory epithelium. That damage impairs mucociliary clearance, which is the normal sweeping mechanism by which cilia move secretions and trapped microbes up and out of the airway. With clearance compromised, opportunistic secondary bacteria — Streptococcus equi subspecies zooepidemicus, Pasteurella multocida, Mycoplasma species — establish on the damaged epithelium and inflammation extends from the bronchial tree down into the alveolar parenchyma. That is bronchopneumonia[67][78].

A puppy can progress from a mild cough to severe pneumonia much faster than an adult dog. Adult dogs with uncomplicated kennel cough typically improve over one to three weeks; a puppy can develop signs of pneumonia soon after the cough first appears[4][5][67]. The warning signs of progression are the ones every puppy parent needs to keep top of mind:

• Fever (rectal temperature 39.5°C (103.1°F) or above)
• Productive cough — mucoid or mucopurulent sputum brought up[67]
• Tachypnoea at rest — respiratory rate that stays above 30 breaths per minute when calm, or more than about 20% above your puppy’s usual
• Anorexia — complete refusal of food (not just being fussy)[4][5]
• Lethargy — not the post-play tiredness, but a flat, unresponsive quality to the puppy
• Cyanosis — bluish or grey discolouration of the gums, indicating oxygen saturation below ~80–85%
• Open-mouth breathing at rest, flared nostrils, or visible flank movement on each breath[67]

Any one of those signs, alone or in combination, means hours-not-days. Thoracic radiographs are the standard way of confirming pneumonia and assessing severity, and puppies with confirmed pneumonia often need hospitalisation for parenteral antibiotics, intravenous fluid support, oxygen supplementation if hypoxia is present, and close monitoring[67]. The good news, of course, is that most puppies who get to the vet promptly — before pneumonia is established — never need any of this. The conservative threshold for vet visits is what prevents the catastrophic outcome.

Medication Considerations in Puppies

Drug choice in a puppy with complicated kennel cough is not a small-adult version of the adult treatment plan. Several medications that are unremarkable in adult dogs need adjustment or avoidance in puppies because of developmental differences in tissue sensitivity and pharmacokinetics. The decisions below are your vet’s, not yours — but understanding the reasoning helps you ask better questions.

Amoxicillin-clavulanate is listed by ISCAID as a first-line option for secondary bacterial upper-respiratory infection, covering Pasteurella, Streptococcus, susceptible Staphylococcus, many anaerobic bacteria and most Bordetella bronchiseptica isolates. ISCAID also records that it is ineffective against all Mycoplasma species, which is one reason the choice of antibiotic depends on what your vet suspects is involved (ISCAID, 2017). Doxycycline is effective against Mycoplasma and Bordetella, and is not ruled out by age in ISCAID’s guidelines, which say it can be used in puppies over four weeks old without enamel discolouration, unlike older tetracyclines; the UK product licence is more cautious and advises against using it before a puppy’s tooth enamel has finished forming (Ronaxan SPC, VMD). Whether and when a particular puppy needs it is your vet’s decision. Fluoroquinolone antibiotics (enrofloxacin, marbofloxacin) should be avoided in growing puppies, and particularly in large and giant breeds. ISCAID records that all quinolones are associated with cartilage problems in growing puppies and kittens (ISCAID, 2017).

Cough suppressants are generally not used in puppies with active infectious respiratory disease. Coughing is the physiological mechanism that clears infected secretions and debris from the airway. Suppress the cough in a puppy who is actively infected and infected mucus pools in the lower airway, which can encourage secondary bacterial pneumonia[4][5][14]. The treatment plan is to support the immune system, maintain hydration and nutrition, treat secondary bacterial infection when present, and not to silence the cough itself.

From the OTC and home-remedy world, the rules are firm. Avoid honey in puppies under 12 months because of the theoretical risk of botulism spores from Clostridium botulinum contamination — this is the puppy-specific caveat to the standard adult home-remedy guidance[4][5]. No garlic, no onion, no essential oils. No human cough medicine, no leftover antibiotics from previous pets, no acetaminophen, no ibuprofen, no aspirin without explicit veterinary direction[4][5]. The honest evidence base for any “natural” intervention in puppy kennel cough is thin; the literature emphasises supportive care and appropriate antimicrobials rather than herbal or supplement approaches.

For the full adult-dog medication framework, see our treatment guide. Use it as background reading; do not extrapolate adult dosing to a puppy.

Home Care for Puppies — Strictly Bounded

If your vet has assessed your puppy, confirmed uncomplicated kennel cough with no signs of pneumonia, and explicitly green-lit home management, the supportive measures below are what helps. None of these is a substitute for veterinary assessment in a puppy under six months — they sit alongside a vet visit, not instead of one.

Hydration. Offer water frequently in small volumes throughout the day — large gulps can provoke coughing. Some puppies prefer lukewarm to cold water. A cool-mist humidifier in the puppy’s resting area adds moisture to the air, eases respiratory comfort and supports clearance of secretions[4][5]. Clean the humidifier daily to prevent bacterial growth in the reservoir.

Rest and stress reduction. Quiet, comfortable area. No daycare, no socialisation classes, no group play for the duration of the illness and for at least fourteen days after symptoms resolve[4][5]. Restrict strenuous activity. Use a harness, not a collar, for any necessary outdoor elimination — collar pressure on the trachea provokes coughing in puppies with tracheitis. Make sure the harness actually fits a small puppy properly; an oversize harness sliding into the throat is worse than a well-fitting flat collar.

Nutrition. Maintain caloric intake. Small, frequent meals beat large infrequent ones in a poorly puppy. High-calorie, easily digestible foods — chicken or fish-based — are more appealing than standard kibble to a puppy who is off their food. If your puppy refuses food entirely, that is anorexia, not pickiness, and it warrants a vet call.

Strict ban list for puppies: no honey under 12 months; no garlic; no onions; no essential oils diffused or applied; no human cough medicine; no acetaminophen, ibuprofen or aspirin; no leftover antibiotics from previous pets; no “natural remedies” recommended by well-meaning friends without checking with your vet first[4][5].

For the full evidence-based home-care framework for adult dogs — including the honey discussion, the steam-room debate, and a more detailed look at humidified air — read our home remedies guide. The puppy-specific overlay is: the same principles, but a much tighter ban list and a much lower threshold for escalating to the vet.

Multi-Puppy Households and Litter Dynamics

Kennel cough rarely hits all puppies in a litter on the same day. Maternal antibody titres, exposure history and individual immune responses all vary between siblings, so the puppy with the lowest residual maternal antibodies typically shows symptoms several days — sometimes a full week — before littermates begin to cough[4][5][67]. The implication is simple: all littermates living together should be treated as exposed regardless of which ones show signs first, and isolation of the litter as a unit (rather than rotating individual puppies in and out of contact with other dogs) is the right outbreak protocol.

Vaccination status should be reviewed across the entire litter. If the breeder’s records are incomplete or the litter is a rescue group, the safest default is to assume Bordetella vaccination is needed and to use the intranasal or oral mucosal route for fastest onset of protection in unaffected littermates[13][45][46].

In shelter and rescue environments, kennel cough is one of the most common infectious challenges and outbreaks can move fast through a susceptible population. Puppies arriving with unknown vaccination history should be vaccinated on arrival with core vaccines and, if other dogs are present and the planned stay is more than a few days, with intranasal Bordetella for rapid mucosal protection[13][45][46]. New arrivals should be isolated from the general population for an observation period of at least five to seven days to allow detection of pre-clinical infection.

For breeders encountering kennel cough in a current litter: isolate the affected and exposed puppies from the dam where practical, review vaccination status across all in-contact animals, implement strict hygiene between puppies (hand washing, separate bowls and bedding), and inform prospective purchasers honestly. Delaying sales until recovery is confirmed protects the new owners and the puppy alike[4][5][45].

Recovery Timeline for Puppies

Most puppies with uncomplicated kennel cough recover over one to four weeks — slightly longer on average than the one to three weeks typical for adults, reflecting continued immune maturation and the fact that secondary complications are a more common feature of the puppy disease course[4][5]. Individual factors matter: age at onset, severity of the initial infection, whether secondary bacterial infection developed, whether antibiotics were appropriately chosen and completed, and the puppy’s overall health status all influence how quickly the cough resolves.

Serial vet rechecks during recovery are more useful in puppies than in adults. A follow-up examination at the end of any antibiotic course (typically 7–10 days after initiation) confirms resolution. Where pneumonia was documented, chest radiographs at recovery confirm clearance of pulmonary infiltrates and rule out chronic sequelae[67].

Activity returns gradually. Keep your puppy out of group settings — daycare, puppy classes, dog parks — for at least fourteen days after the last cough, both to reduce transmission risk to other puppies and to protect your still-healing puppy from re-injuring a sensitive airway[4][5]. A stepwise return looks like: home play first, then supervised one-on-one play with a known healthy vaccinated dog, then group classes only when the puppy is back to fully normal behaviour and respiratory function.

If a vaccination was administered during the acute illness, your puppy’s immune system may not have responded optimally; ask your vet whether a booster at recovery is sensible to ensure protection is solid going into the next exposure season. For the standard day-by-day adult recovery timeline (incubation, peak, resolution), see our companion article on how long kennel cough lasts. The puppy timeline tends to run slightly longer, with more vet involvement built in.

Frequently Asked Questions

Can my unvaccinated puppy still get kennel cough?

Yes — in fact, an unvaccinated puppy in any high-exposure setting (breeder, shelter, daycare, multi-dog household, puppy class) is at substantially elevated risk because they have no active immunity and any maternal antibodies are waning. If your puppy is unvaccinated and develops a cough, see your vet promptly; do not wait to see if it resolves.

Is kennel cough dangerous for puppies?

It can be. In adult dogs, most cases are mild and self-limiting; in puppies under six months, the risk of progression to pneumonia is substantially higher because of smaller airways and lower respiratory reserve. The disease is dangerous specifically through its potential to develop into pneumonia, not through the cough itself.

How can I tell if my puppy’s cough is getting worse?

Look for systemic signs that point beyond simple cough: lethargy, refusal to feed, a fever of 39.5°C (103.1°F) or above, productive cough (cough that brings up anything), fast breathing at rest (a rate that stays above 30 per minute, or more than about 20% above your puppy’s usual), belly breathing, open-mouth breathing, or pale or blue-tinged gums. Any one of those is an escalation signal — vet now, not tomorrow.

Can I give my puppy honey for kennel cough?

No — not in puppies under twelve months of age. Honey can carry Clostridium botulinum spores and the theoretical botulism risk is the reason honey is contraindicated in puppies just as it is in human infants under one year. For puppies, stick to hydration, humidified air and veterinary-directed treatments.

How soon can I give my puppy the Bordetella vaccine?

Intranasal Bordetella vaccines can be given from six weeks of age; oral Bordetella vaccines are typically held until eight weeks because the more acidic gastric environment in very young puppies can destabilise the vaccine. Injectable Bordetella vaccines are usually reserved for puppies who can’t tolerate mucosal administration.

Will my vaccinated puppy still cough sometimes?

Possibly. A mild dry cough within three to seven days of an intranasal Bordetella vaccine is a known vaccine reaction and represents the mucosal immune response activating. It is mild, the puppy is otherwise well, and it resolves within a week. If the cough is severe, productive, accompanied by fever, lethargy or appetite loss, or lasts longer than seven days, that is not a vaccine reaction — that is illness.

How long should I keep my puppy isolated?

For the duration of clinical signs plus at least fourteen days after the last cough. That window reflects the period during which the puppy can still shed pathogens to other dogs, and also gives the airway time to fully recover before re-exposure. Skip daycare, puppy classes, the dog park and play dates during that entire period.

Can I take my coughing puppy to puppy class?

No. Even if the cough is mild, you are exposing other puppies (many of whom may not yet be fully vaccinated either) to an active respiratory infection. Reschedule the class for after your puppy is fully recovered and the fourteen-day post-recovery isolation has passed. Most reputable puppy class providers will appreciate the heads-up and won’t penalise you for cancelling.

Should I worry if my puppy was at daycare 5 days ago?

Kennel cough has an incubation period of usually two to ten days, most often five to ten. A five-day window is well within that range, so a cough appearing now in a puppy who was recently in daycare is consistent with daycare exposure. Inform the daycare so they can flag other puppies who attended the same session, and see your vet.

What if I have other dogs at home?

Treat the affected puppy as infectious to other household animals. Isolate them in a separate area, do not share toys, bowls or bedding, wash hands between contact with the affected puppy and other dogs, and review the vaccination status of every dog in the household. Adult dogs with current Bordetella vaccination are much better protected than the puppy is, but they can still be infected and they can still spread the infection further.

What To Do Next

1. Pause and assess. Check breathing rate at rest, gum colour, body temperature (if you have a rectal thermometer), and overall energy. Note when the cough started.
2. Decide on the age band. Under 6 weeks: vet immediately. 6–12 weeks: call your vet today. 12–16 weeks: call your vet today, especially if any systemic signs. 16+ weeks: call your vet if the cough is getting worse, or your puppy is off its food, lethargic, feverish (39.5°C (103.1°F) or above) or breathing harder. Open-mouth breathing, pale or blue gums or struggling to breathe is an emergency at any age.
3. Ring the vet. Describe what you’re seeing: the cough’s character (dry vs productive), duration, any other signs, and your puppy’s vaccination status. Out-of-hours if it’s evening or weekend and systemic signs are present.
4. Set up a safe rest area. Quiet, warm but not hot, away from other animals and high-traffic parts of the home. Add a cool-mist humidifier if you have one.
5. Hydrate frequently. Small volumes of fresh water several times an hour. Cooled low-sodium broth or canine-specific electrolyte solution if the puppy is reluctant to drink water alone.
6. Switch to harness only. No collar pressure on a coughing trachea. Use a properly-fitting puppy harness for any necessary outdoor breaks.
7. Isolate from other dogs. Including dogs in your own home. Wash hands between contact. Don’t share toys, bowls or bedding.
8. Monitor and document. Track respiratory rate at rest, appetite, energy and cough frequency twice a day. Photos of gum colour are useful. If anything worsens, return to step 3.

If you’ve read this far, you’re already doing the most important thing — paying attention. Kennel cough in puppies is scary, particularly at 11pm when your puppy is coughing and the practice is closed and the internet is full of contradictions. The honest reassurance is that the overwhelming majority of puppies who get to the vet promptly recover fully, complete their vaccination series, and grow into healthy adult dogs. The work is in being vigilant during the narrow window where small signs matter, in trusting your instinct that something is off, and in not waiting on a Friday-night cough because tomorrow seems close enough. Tomorrow can be too far. Ring your vet now. Most of the time it will be nothing serious, and finding out that it’s nothing serious is exactly the point.