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Short answer: measure your dog standing: chest girth around the widest part of the ribs, back length from the collar to the base of the tail, and neck girth where the collar sits. Leave room for two fingers under the tape, then match the numbers to that coat’s chart, because sizes differ a lot between brands. Chest decides the size; between sizes, go up. Owners of five popular coats complained about size about ten times as often as about warmth, so the tape measure matters more than the brand.
A note from Helen: Teya, our Pomeranian, has a thick double coat and rarely needs a jacket, but small, thin-coated and older dogs often do. This guide isn’t a test of coats on our dogs. The measuring method comes from the American Kennel Club; the advice on which dogs need a coat comes from veterinarians quoted by PetMD and from the UK vet charity PDSA; the size charts come from each coat’s Amazon listing; and the complaints come from Amazon’s summaries of thousands of owner reviews.
Does your dog need a coat?
Veterinarians quoted by PetMD say short-coated, thin-coated and thin-framed dogs should wear a jacket in the cold months, and PDSA adds very young, old, underweight and unwell dogs. A thick undercoat is what keeps a dog warm, so size alone doesn’t decide it: a Great Dane or a Greyhound can need a coat, and a Husky usually doesn’t.
| Usually needs a coat | Sometimes | Usually doesn’t |
|---|---|---|
| Chihuahuas, toy poodles, Italian Greyhounds, Whippets, Greyhounds, Chinese Crested, Yorkies | Short-legged dogs (Bassets, Dachshunds, Corgis) whose bellies touch snow; short-coated large dogs such as Great Danes and some Pit Bulls; Frenchies and Shih Tzus may only need a sweater | Huskies, Malamutes and other thick double-coated breeds, if healthy |
| Puppies, seniors, underweight or sick dogs | Healthy adults on long, wet or windy walks | Any dog on a quick potty break, or indoors |
Not sure today’s weather calls for it? Our cold-weather walk chart and calculator sorts dogs by size and coat and gives a walking plan for each temperature band. Watch your dog too: PetMD’s vets list holding up paws, refusing to walk and shivering as signs a dog is cold.
Coats can overheat dogs. PetMD lists heavy panting, drooling and red gums as signs of overheating; call your vet if you see them. Never leave a dog alone in a coat, and take it off indoors. A coat also doesn’t protect ears, tail and paws from frostbite, so keep very cold walks short.
How to measure your dog for a coat
- Back length: the AKC says to measure along the top of the spine from the base of the neck, where the collar sits, to the base of the tail.
- Chest girth: wrap the tape around the largest part of the rib cage, usually just behind the front legs, snug but not tight.
- Neck girth: measure around the base of the neck, where a collar sits.
- Two fingers of room: the AKC’s rule is to slip two fingers between the tape and your dog.
- Write down inches and centimeters. PDSA’s tip: some coats are sized in one, some in the other.
For a male dog, check where the coat’s belly panel ends. The AKC suggests a shorter underside fit so the coat stays dry.
Dog coat size calculator
Which size in each coat?
Enter your dog’s measurements in inches. Chest is required; neck and back make the result more accurate. Nothing you type leaves your browser.
The calculator uses each maker’s chart. For range charts we size up when your chest is within an inch of the top of a size; for single-number charts we add an inch of room.
Size charts side by side
The same “Medium” means very different dogs. This is each maker’s chest range in inches, from the Amazon listings on October 22, 2026:
| Size | Kuoser | FUAMEY (max chest) | Kurgo Loft | Carhartt | Gooby fleece (chest / back) |
|---|---|---|---|---|---|
| XS | 9.4–13.8 | 13.8 | 15–20 | – | 10.5 / 7 |
| S | 13.8–17.3 | 17.3 | 19–27 | 17–22 | 12.5 / 9 |
| M | 17.3–20.9 | 20.9 | 26–35 | 23–29 | 15 / 11.5 |
| L | 20.9–24.4 | 24.4 | 30–39 | 29–36 | 19 / 13.5 |
| XL | 24.4–29.5 | 29.9 | 35–45 | 36–46 | 21.5 / 16.5 |
| 2XL | 29.5–35.4 | 35.4 | – | – | 23.5 / 18.5 |
| 3XL | 35.4–43.3 | 43.3 | – | – | 26 / 20.5 |
A dog with a 21-inch chest is a Large in Kuoser and FUAMEY but a Small in Kurgo and Carhartt. That is why the reviews below are full of “runs small” and “runs big” at the same time. Gooby goes to 6XL (34.5-inch chest, 27.5-inch back) and asks you to choose by back length. Carhartt’s listing gives two slightly different charts; we used its size table.
Which kind of coat?
| Type | Best for | Watch out for |
|---|---|---|
| Fleece-lined waterproof coat | Most small and medium dogs on wet, cold walks | “Waterproof” often means one side only; Velcro wears and collects fur |
| Coat with a built-in harness | Calm small dogs: one thing to put on, leash clips to the back | Not for pullers; FUAMEY itself suggests a separate harness for dogs that lunge |
| Light reversible jacket | Active dogs, fall and mild winter, dogs who hate bulk | Less warmth for tiny or thin-coated dogs in deep cold |
| Canvas work coat | Medium and large dogs in wind, brush and hard use | Heavier; sizes start at a 17-inch chest |
| Stretch fleece pullover | Dry cold, deep-chested and long dogs, indoor-outdoor layering | Not waterproof; goes over the head, which some dogs dislike |
PetMD’s experts add three rules for any coat: easy to get on and off, not so bulky that walking is hard, and no buttons or small decorations a dog could chew off and swallow.
What owners complain about
I looked at Amazon’s review summaries for the five coats below on October 22, 2026. For each topic, Amazon counts how many reviews mention it and whether they are positive or negative.
| Coat | Size or fit complaints | Warmth complaints | Other common complaint |
|---|---|---|---|
| Kuoser Reversible | 1,722 of 2,361 size mentions negative | 149 of 2,566 | Velcro: 531 of 1,183 negative (comes undone) |
| FUAMEY with harness | 322 of 490 sizing mentions negative | 13 of 1,052 | Zipper: 258 of 581 negative (won’t stay zipped) |
| Gooby Stretch Fleece | 450 of 658 size mentions negative | 13 of 804 | Few others |
| Kurgo Loft | 218 of 314 sizing mentions negative | 97 of 509 | Durability: 198 of 332 negative (collar coming off) |
| Carhartt Chore Coat | 17 of 30 sizing mentions negative | 5 of 61 | Few complaints overall |
Added up, that is about 2,700 negative size mentions against fewer than 300 about warmth. Most of these coats are warm enough; what goes wrong is the fit, and the complaints point both ways (“runs small” and “runs big” for the same coat). Measure all three numbers, read that coat’s chart, and keep the packaging until you have tried it on.
Coats worth buying
Affiliate note: some links in this guide go to Amazon. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. We choose products for fit, safety and specifications, not for the commission.
7 sizes, fleece-lined, leash hole.
Check on AmazonZip-up, built-in harness, reflective.
Check on AmazonShopping on Black Friday? Measure your dog now, then add the right size of our top pick to your Amazon cart so it is ready when deals start.
How I chose
- I started from the AKC measuring method and the PetMD and PDSA advice on which dogs need coats, then looked for coats that cover different dogs: tiny and thin-coated, deep-chested, long-backed and large.
- I favored coats with full size charts (chest, neck and back) on the listing, so you can size them before you buy.
- I read Amazon’s review summaries for each and noted the complaints, not just the praise.
- I checked every listing on October 22, 2026 for stock and U.S. delivery. Picks are based on specifications and owner feedback, not on tests with Teya.
Best for most dogs: Kuoser Waterproof Reversible Dog Coat
The best-selling dog cold-weather coat on Amazon (number 1 in Dog Cold Weather Coats when I checked) with more than 59,000 ratings. One side is plaid, the solid side is the waterproof one, and the lining is a double layer of fleece. Velcro at the neck and belly makes it easy on a wriggly dog.
- A size for almost every dog, with chest, neck and back on the chart.
- Owners say it is easy to put on and off and keeps dogs warm.
- Good value for a lined, waterproof coat.
- Fit, in both directions: an 8 lb Shih Tzu was swimming in an XS, while others say it runs small. Measure first.
- Velcro that comes undone on active dogs.
- Amazon’s summary says it is water-resistant “in light rain”; don’t expect it to stay dry in a downpour.
Skip it if your dog spends long walks in heavy rain or deep snow; look at the Carhartt or a fully waterproof shell.
Check it on AmazonSmall dogs, one-step walks: FUAMEY Fleece Dog Winter Coat with Harness
A zip-up coat with a harness built in: two D-rings on the back take the leash, so there is one thing to put on. It has a fleece lining, a plush turtleneck with an adjustable collar and reflective strips, and Amazon ranked it number 2 in Dog Cold Weather Coats when I checked.
- Very warm for its weight: only 13 of about 1,050 warmth mentions are negative.
- No Velcro to clog with fur.
- Turtleneck collar keeps wind off the neck.
- The zipper: about 4 in 10 owners who mention it say it won’t stay zipped or broke early.
- Sizing in both directions; one owner sized up to cover more of the back.
Safety note from the maker: the built-in harness is meant for calm small dogs. For dogs that pull or lunge, and for medium and large dogs, the listing recommends a separate harness.
Skip it if your dog pulls hard on the leash.
Check it on AmazonLight and harness-friendly: Kurgo Loft Reversible Dog Jacket
A thin quilted jacket with a water-resistant ripstop shell, reflective piping and a zippered opening on the back for a harness clip. It adjusts at two Velcro side points, which helps dogs with a big chest and a small waist. Kurgo backs its gear with a lifetime warranty, according to the listing. It’s also the coat we suggest in our cold-weather walking guide.
- Light enough for active dogs who overheat in puffers.
- Works over a harness.
- Wide chest ranges for deep-chested dogs.
- Sizing: some find the Medium runs big and the chart off. The XS starts at a 15-inch chest, too big for many toy dogs.
- Durability: owners report the collar coming off and Velcro that loses grip.
- Some colors and sizes showed only a few left in stock on October 22.
Skip it if you have a toy dog or need serious warmth below freezing.
Check it on AmazonBig, active dogs: Carhartt Firm Duck Insulated Dog Chore Coat
A 12-ounce duck canvas shell with a quilted insulated lining and a corduroy-lined collar, adjustable at the neck, chest and waist. Owners use it on Labs, Pit mixes, Vizslas and Whippets that run through brush. It rates 4.8 stars, the highest here, though on far fewer ratings (about 890).
- Tough enough for barbed wire and brambles, owners say.
- Warm without being puffy.
- Wide Velcro tabs fit big chests and short bodies.
- Very little: the main gripe is sizing, with some saying it runs large.
- It’s weather-resistant canvas, not a rain shell.
Skip it if your dog’s chest is under 17 inches; the Small starts there.
Check it on AmazonDeep-chested and long dogs: Gooby Stretch Fleece Vest
A pullover in 4-way stretch fleece with full underbody coverage and no zippers. It comes in ten sizes from a 7-inch to a 27.5-inch back, and owners of Dobermans, Ridgebacks, Pit mixes and hounds say it is one of the few pullovers that fits their dogs.
- Soft and warm without bulk; only 13 of about 800 warmth mentions are negative.
- Stretch handles deep chests and narrow waists.
- Also works as a layer under a rain shell.
- Runs small for many: 450 of 658 size mentions are negative. Gooby says to choose by back length and make sure the neck opening is bigger than your dog’s head.
- Not water-resistant.
Skip it if your walks are wet, or your dog hates things pulled over its head.
Check it on AmazonSalted sidewalks are the other half of winter walks: see dog boots for winter for when boots help and how to size them by paw width.
Fit check when it arrives
Coat fit checklist
PDSA’s sign of a bad fit: a dog that bites, scratches or rubs at its coat. PetMD adds that some dogs react to fabrics or detergents, so watch for itching or hives in the first few days.
Got a fluffy small dog? Read how to brush a Pomeranian: the three tools, line brushing and why not to shave a double coat.
Frequently asked questions
How do I measure my dog for a coat?
With your dog standing, measure the back from the base of the neck, where the collar sits, to the base of the tail; the chest around the widest part of the rib cage just behind the front legs; and the neck around its base. Keep the tape snug but able to fit two fingers underneath, then compare all three numbers with the coat’s own size chart.
What if my dog is between two sizes?
Go up a size. The AKC says a slightly looser coat is more comfortable than a tight one, and most coats adjust at the neck and belly with Velcro or straps.
Which measurement matters most for a dog coat?
Chest girth. Most coat charts are built around it, and a coat that is too tight at the chest rubs behind the front legs. Back length decides how much of the back is covered, and the neck decides whether it goes over the head comfortably.
What size coat for a 20 lb dog?
There is no single answer, because a 20 lb Frenchie and a 20 lb Whippet have very different chests and backs. Measure the chest and back and use the calculator in this guide, which matches your numbers to five makers’ charts.
Should my dog wear a coat indoors?
Usually not. PDSA notes that most dogs don’t need a coat indoors and can overheat in a heated home. Take it off when you come in, and dry it before the next walk.
Do dogs with thick double coats need a coat?
Most don’t. PetMD and PDSA both say Huskies and Malamutes handle cold well. Age, health and body condition can change that, so watch for shivering or slowing down.
Paws & Picks is a participant in the Amazon Services LLC Associates Program. As an Amazon Associate we earn from qualifying purchases. Product details can change; check the current listing before you buy.
Sources
- American Kennel Club: How to measure your dog for gear (updated August 2026)
- PetMD: Do some breeds actually need dog coats?
- PDSA: Vet Q&A, does my dog need to wear a coat on winter walks?
- Amazon product listings and review summaries for the five coats above, checked October 22, 2026.
