We sell coats, so treat this with appropriate suspicion. Most dogs do not need one. The ones that do are identifiable in about ten seconds, and the temperature at which it starts to matter is lower than most shops imply.
The working threshold is around 7°C (45°F), and it applies only to some dogs. Above that, a healthy dog with a normal coat is fine. Below it, small breeds, short or single-coated breeds, thin dogs, puppies and seniors start losing heat faster than they generate it. At 0°C (32°F) those same dogs are on a clock outdoors — roughly 15 minutes for a small dog. A malamute in the same weather is enjoying itself and does not want your jacket.
Temperature thresholds
| Above 7°C / 45°F | Most dogs need nothing |
|---|---|
| Below 7°C / 45°F | Coat worth it for the four groups below |
| Below 0°C / 32°F | Limit time out: ~15 min small dog, ~30 min large double-coated |
| A coat does not prevent | Frostbite — which takes ears, tail and paws |
| Always | Take it off indoors |
Which dogs need one, and which actively do not
| Group | Why | Examples |
|---|---|---|
| Small breeds | Large surface area relative to body mass; sheds heat fast | Chihuahua, dachshund, toy breeds |
| Short or single-coated | No dense undercoat doing the insulating | Greyhound, whippet, boxer, Boston terrier, French bulldog, pit bull types |
| Thin or lean dogs | Body fat is insulation | Any underweight or naturally lean dog |
| Puppies, seniors, chronically ill | Poor thermoregulation; less muscle mass to generate heat | Under 6 months, over 8 years |
| Do NOT need one | Double-coated cold-weather breeds — a coat is pointless at best, uncomfortable at worst | Husky, malamute, Newfoundland, Bernese, Great Pyrenees, Samoyed, akita, chow chow |
If your dog is shivering, lifting paws up to avoid the cold, or burrowing under a blanket, they may be a candidate for winter clothing.
Melissa Pezzuto, Best Friends Animal Society
Read the dog, not the thermometer
The numbers are a starting point; individual tolerance varies enormously. A dog raised in a warm climate experiences 7°C differently from one raised in Norway. Watch for shivering, whining, slowing down, lifting paws off the ground, or turning back toward home. Any of those means go in, coat or no coat.
Two things a coat does not do. It will not prevent frostbite, which affects the extremities — ears, tail and paws — that a coat does not cover. And it will not make a dog that hates wearing clothes tolerate them. If yours freezes, flattens or refuses to walk in it, that is a no. Shorten the walk instead.
Coat, sweater or raincoat — not interchangeable
This is the most common purchase error in the category.
| Weather | What works | What fails, and why |
|---|---|---|
| Cold and dry | Padded coat, fleece-lined jacket | A shell alone adds almost no warmth |
| Wet | Raincoat — a shell | A sweater soaks through. Wet fabric against skin pulls heat out, leaving the dog colder than no layer at all |
| Wet and cold | Shell over insulation, or a coat that is both | Either one alone leaves a gap |
| Cool indoors | Sweater or fleece | Not rain gear |
| Salt, ice, grit | Boots | Sized by paw width, not dog size |
Getting the fit right
Sizing is by measurement, never by breed. Back length along the spine from collar to tail base, and chest girth behind the front legs. Most pet clothing runs small against US sizing, so size up if between two.
Check the armpits for rubbing after the first few wears — that is where a slightly tight coat shows first. And take it off indoors, every time. That is the mistake we see most: a padded coat works perfectly next to a radiator, which is exactly the problem.
Common questions
My dog has a thick coat but still shivers. What now?
Shivering in a double-coated breed is worth a vet conversation rather than a jacket — it can signal pain, anxiety or illness rather than cold.
Should my dog wear a coat indoors?
No, with one exception: a hairless breed, or a dog recently clipped, in a cold house. Otherwise indoor wear risks overheating and skin problems under the fabric.
What about boots?
Different job entirely. Boots are for salt, grit and ice rather than temperature, and they need several short indoor sessions before a real walk. Measure paw width with the foot bearing weight.
Is a coat enough below freezing?
No. Below 0°C the limiting factor is time, not clothing — around 15 minutes for a small dog. Several short walks beat one long one.
How do I know if the coat fits?
It should cover the back from collar to tail base without restricting the shoulders, and you should fit two fingers under any strap.
What to buy, matched to your weather
If your dog is in one of the four groups above, here is the shortlist. Measure back length along the spine first — it is the number every one of these is sized by.
| Conditions | What to get | Check before ordering |
|---|---|---|
| Cold and dry | Fleece-lined cotton winter coat | Back length; take it off indoors |
| Cold, dark walks | Hooded coat with reflective strap | Reflective trim helps drivers see you, not warmth |
| Small or flat-faced breeds | Thick jacket cut for broad chests | Chest girth as well as back length |
| Cool indoors, mild days | Polar fleece coat | Fleece is not rain gear — it soaks through |
| Wet | Reflective raincoat or polyester raincoat | A shell adds little warmth — layer it if it is also cold |
| Salt, grit and ice | Waterproof suede boots | Paw width with the foot bearing weight; several indoor sessions first |
If your dog walks in both cold and wet weather, the two layers are separate purchases. A coat for dry cold and a shell for rain will each last several winters; one garment doing both jobs badly is the thing people replace after one season.
What we will not sell you: a coat for a husky, malamute, Newfoundland, Bernese, Great Pyrenees, Samoyed, akita or chow chow. If that is your dog, save the money.
Browse all coats, raincoats and boots — sorted by weather rather than by look, with the measuring rule on every page.
Sources
- American Veterinary Medical Association — cold weather pet safety guidance
- ASPCA — cold weather safety tips, including antifreeze and paw care
- American Kennel Club — hypothermia and frostbite risk in freezing conditions
- Small Door Veterinary — coat thresholds by dog type and size
- Melissa Pezzuto, Best Friends Animal Society — behavioral signs a dog is cold
Written by Kindopet Guides. Reviewed 6 September 2026. General guidance, not veterinary advice. Suspected hypothermia is an emergency — call your vet.