Puppies feel the cold sooner than adult dogs, and they're also the dogs most likely to hate wearing a coat the first time. Both of those are solvable, but they pull in opposite directions: you want the coat on for warmth, and you want to introduce it slowly enough that your puppy doesn't decide clothing is a threat.
This guide covers when a puppy actually needs a coat, how to size one for a dog who's growing weekly, how to introduce it without a fight, and how to make it work with the harness your puppy is probably learning to walk in.
Part of our complete guide to choosing a dog coat — see the full series for every style, material and use case.
When Does a Puppy Need a Coat?
Puppies regulate their body temperature less efficiently than adult dogs. They have less body mass, thinner coats, and less fat, so they lose heat faster and tire sooner in the cold. A puppy who's happy for the first ten minutes can be shivering by the twentieth.
As a rough guide, a puppy benefits from a coat once you're walking in single-figure temperatures — earlier for small, thin-coated or short-haired breeds, later for thick double-coated ones. Watch for shivering, slowing down, lifting paws, or trying to turn back; those tell you more than the forecast does.
There's a timing point worth knowing. Puppies often start outdoor walks in autumn once their vaccinations are complete, which means a lot of first walks happen exactly as the weather turns. That's also when you're building their opinion of walks generally — a cold, miserable first month doesn't help.
Very young puppies shouldn't be out long in cold weather at all, coat or not. Short, frequent outings beat one long walk, and your vet's guidance on exercise limits comes first.
Sizing a Coat for a Growing Puppy
Size for the puppy you have now, not the dog they'll become. It's the single most common mistake, and it's counterproductive: an oversized coat slides around, gapes at the neck, catches under the back legs and lets cold air straight in. It does less than no coat, because your puppy learns that coats are annoying.
Measure back length — base of the neck to the base of the tail — and match it to the chart. That's the measurement that matters; the velcro at the neck and chest absorbs the variation in girth, which also buys you some growing room.
| Size | Back length | Depth | Typically suits |
|---|---|---|---|
| XS | 35cm | 15cm | Puppies, mini dachshunds, Maltese, Shih Tzus |
| S | 42cm | 18cm | Cavapoos, small cockapoos, pugs, small spaniels |
| M | 52cm | 23cm | Larger cockapoos, Staffies, collies, larger spaniels, beagles |
Accept that a puppy of a medium or large breed will likely need two coats across their first year. That's the honest position — a coat bought to last until adulthood won't fit during the months you actually need it.
Re-measure every few weeks during a growth spurt. The sign a coat has been outgrown isn't that it looks small; it's that it rides up, sits short of the tail, or pulls when your puppy walks.
Introducing a Coat Without a Fight
Most puppies object to the putting on, not the wearing. Work on that specifically.
Start indoors, with no fastening. Let your puppy sniff the coat, then simply rest it over their back for a couple of seconds and take it off again, with a treat. Repeat over a few short sessions.
Then fasten it briefly. Neck and chest, done up, for maybe thirty seconds while something good happens — dinner, a game, a chew. Take it off before your puppy gets fed up rather than after.
Build duration indoors before you go out. A puppy who's worn the coat happily around the kitchen for five minutes will barely notice it on a walk.
Expect the freeze. Lots of puppies stand stock still the first time they wear anything. Don't fuss or sympathise heavily; just move, encourage, and let them work out they can walk normally in it.
Velcro fastenings help here, because nothing goes over the head — which is the bit most puppies dislike most.
Coats and Harnesses for Puppies
Most puppies learn to walk in a harness rather than a collar, which is the right call for a growing dog with a delicate neck. Our puppy collection covers the first-harness sizes. That makes coat-and-harness compatibility matter from day one.
Put the harness on first, directly against your puppy, then the coat over the top with the lead clipping through the opening on the back. Fitting the harness against the dog means the fit you set is the fit you keep, which matters doubly with a puppy you're re-adjusting as they grow.
It also means one fewer thing to take on and off at the car — and with a wriggling puppy, that's worth more than it sounds. Our guide to coats with a harness covers the layering order in full, and our puppy harness guide covers choosing the harness itself.
One safety note that applies especially to puppies: never clip the lead to a loop on the coat. Many are stitched to the outer fabric only. Always clip to the harness.
What to Look For in a Puppy Coat
- Adjustable velcro at neck and chest — accommodates growth and avoids anything over the head
- A lead opening on the back, because your puppy is almost certainly in a harness
- Published back-length measurements, not just "small / medium"
- Water-resistant outer — puppies find wet grass irresistible
- A fleece lining for actual warmth rather than just wind resistance
- Machine washable, because it will need washing constantly
- A rear cut that stays clear, since puppies toilet far more often than adults
Our Coats for Puppies
Our quilted dog coats suit puppies well: adjustable velcro rather than anything pulled over the head, a lead opening for harness users, a water-resistant quilted outer and a teddy-fleece lining. The XS, at 35cm back length, is the usual puppy starting size.
Foxbury Plaid has a matching harness, collar and lead in the same tartan, available together as a harness bundle — convenient if you're buying a first harness at the same time.
Khaki Tweed is the pragmatic choice for a puppy, because khaki hides mud and a puppy will find all of it.
Both machine wash at 30°C.
Shop dog coatsFrequently Asked Questions
At what age can a puppy wear a coat?
As soon as they're going outside for walks, which is usually once vaccinations are complete. Indoors, a healthy puppy in a heated house doesn't need one.
What size coat for a puppy?
Measure back length from the base of the neck to the base of the tail. The XS, at 35cm, suits most puppies to start with. Don't buy large to "grow into".
Should I buy a bigger coat so it lasts?
No. An oversized coat gapes, slides and lets cold air in, and it teaches your puppy that coats are uncomfortable. Medium and large breeds will need a second size later — that's normal.
How do I get my puppy used to wearing a coat?
Short indoor sessions with treats, starting with the coat resting on their back before you fasten anything. Build up to a few minutes indoors before using it on a walk.
Can a puppy wear a harness with a coat?
Yes, and it's the best setup. Harness first, coat over the top, lead through the opening on the back.
How cold is too cold for a puppy walk?
There's no single figure — it depends on breed, size and age. Shivering, slowing, paw-lifting or trying to head home all mean it's time to go in. Several short outings beat one long one in winter.
Do puppies need coats indoors?
Rarely. A puppy shivering in a warm house is worth a vet conversation rather than a jumper.
How often will I need to wash it?
Often. Pick something machine washable at 30°C and air dry it — heat drying flattens the lining.
