Is kennel cough serious in puppies?

Kennel cough is usually mild and self-limiting, typically producing a harsh cough while the puppy otherwise stays bright and eating normally, and it commonly resolves within one to three weeks. It is still worth a vet visit to confirm the diagnosis and rule out anything more serious, especially in a young puppy.

Can a collar make a puppy's cough worse?

Pressure on the throat from a collar, particularly during pulling on the lead, can trigger or worsen a cough in some puppies. Switching to a well-fitted harness takes that pressure off the throat and windpipe, which many owners and vets find genuinely helps, though it does not treat whatever is causing the cough underneath.

Should I stop walking my puppy if they have a cough?

Not necessarily, unless a vet has specifically advised rest — keeping walks calm and avoiding a collar that puts pressure on the throat is usually more practical than stopping exercise altogether. If the cough is worsening or your puppy seems unwell, get them checked before deciding on exercise.

Can puppy coughing be caused by something other than infection?

Yes — a foreign object caught in the throat, irritation from pulling against a collar, or in rarer cases a heart or airway problem can all cause coughing in puppies. This is exactly why a persistent or worsening cough is worth a vet's assessment rather than assuming it is always a mild infection like kennel cough.

Why is my puppy coughing?

A cough in a puppy is a symptom, not a diagnosis, and the same sound can come from causes ranging from mild and self-resolving to genuinely urgent. Kennel cough, a common and usually mild infection especially in puppies recently around other dogs, is one of the more frequent causes, but a persistent, worsening, or laboured cough — particularly alongside blue-tinged gums, collapse, or real difficulty breathing — needs a vet the same day, not a wait-and-see approach.

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This is worth a call to your vet rather than waiting to see how it goes, particularly if it has lasted more than a day or your pet is otherwise off-colour.

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What a mild cough often looks like

Kennel cough typically produces a harsh, honking cough that can sound alarming but often leaves the puppy otherwise bright, eating and playing normally between coughing episodes. It commonly follows recent contact with other dogs — a puppy class, kennels, or a busy park — and usually settles within one to three weeks with rest, though it is still worth a vet check to confirm and to rule out anything else.

A cough that only appears after excitement, pulling on a lead, or drinking water, and does not otherwise affect the puppy's energy or appetite, is also commonly seen and less immediately concerning than one accompanied by lethargy or laboured breathing.

When it is more than a simple cough

Ring a vet the same day if the cough is persistent and worsening, if your puppy seems to be struggling to breathe, has blue or pale gums, has collapsed or seems unusually weak, or is coughing up anything unusual. These can point to more serious causes including pneumonia, a foreign object, or in rarer cases a heart or airway problem that needs prompt attention rather than a routine appointment.

A young puppy generally has less reserve than an adult dog if something is genuinely wrong, so it is better to have a cough checked and find it is minor than to wait and see with a very young animal.

What can help while you get it checked

If your puppy currently wears a collar, switching to a well-fitted harness reduces pressure directly on the throat and windpipe, which can make a cough triggered or worsened by pulling on the lead noticeably less frequent — this is a genuinely common piece of advice for dogs with any cough or throat sensitivity, not a treatment for the underlying cause.

Keeping walks calm and on a lead that does not encourage pulling, rather than stopping exercise altogether unless a vet advises rest, is generally the more practical approach while working out what is causing the cough.

Keeping other dogs in the house protected

Kennel cough spreads readily between dogs in close contact, so if you have more than one dog at home, keeping a coughing puppy away from housemates where practical is sensible, particularly if another dog is elderly, very young, or already unwell. Shared water bowls, toys, bedding and food bowls are worth washing more often than usual for as long as symptoms last, since infection can pass between dogs through these just as easily as through direct nose-to-nose contact.

Most puppies receive vaccination against some of the causes of kennel cough as part of their routine vaccination course, though no vaccine covers every possible cause of a kennel-cough-type cough, so a fully vaccinated puppy can still develop a mild case. If your puppy has recently spent time around a lot of other dogs — a puppy class, a stay in kennels, or a busy dog-friendly park — mentioning that timing to your vet is genuinely useful, since it helps them judge how likely kennel cough is against the other, less common causes of a puppy cough. Letting the puppy class or kennels know is worth doing too, so other owners can watch for the same thing.

What can help

Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.

Padded No-Pull Dog Harness Vest

A soft padded vest harness that spreads pressure evenly across the chest for comfortable, no-pull control. Adjustable straps, breathable mesh lining and reflective trim make everyday walks safer.

From£35.99

Faux-Leather Dog Harness & Lead Set

A smart faux-leather harness and matching lead set with gold-tone hardware and quick-release buckles. The padded, adjustable harness spreads pressure comfortably for stylish, secure walks. Suits small dogs and cats.

From£13.99

Dog Car Seat Belt Safety Tether

An adjustable nylon car safety tether that clips into your seatbelt buckle and onto your dog's harness, keeping them safely restrained while you drive. Strong metal clasp and durable webbing.

£24.99

Waterproof Dog Harness, Collar & Lead Set

A sturdy waterproof harness, collar and lead set that keeps walks tidy and your dog under control.

From£7.99

Common questions

Is kennel cough serious in puppies?: Kennel cough is usually mild and self-limiting, typically producing a harsh cough while the puppy otherwise stays bright and eating normally, and it commonly resolves within one to three weeks. It is still worth a vet visit to confirm the diagnosis and rule out anything more serious, especially in a young puppy.
When should I take my coughing puppy to the vet urgently?: See a vet the same day if the cough is persistent and getting worse, your puppy seems to be struggling to breathe, has blue or pale gums, has collapsed, or seems unusually weak or lethargic. These signs can point to something more serious than a simple cough and need prompt attention.
Can a collar make a puppy's cough worse?: Pressure on the throat from a collar, particularly during pulling on the lead, can trigger or worsen a cough in some puppies. Switching to a well-fitted harness takes that pressure off the throat and windpipe, which many owners and vets find genuinely helps, though it does not treat whatever is causing the cough underneath.
Should I stop walking my puppy if they have a cough?: Not necessarily, unless a vet has specifically advised rest — keeping walks calm and avoiding a collar that puts pressure on the throat is usually more practical than stopping exercise altogether. If the cough is worsening or your puppy seems unwell, get them checked before deciding on exercise.
Can puppy coughing be caused by something other than infection?: Yes — a foreign object caught in the throat, irritation from pulling against a collar, or in rarer cases a heart or airway problem can all cause coughing in puppies. This is exactly why a persistent or worsening cough is worth a vet's assessment rather than assuming it is always a mild infection like kennel cough.

Sources

Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.

Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.