It is 6 a.m. and your dog is waiting at the door. The coat you ordered last week is either squeezing their shoulders or sliding sideways like a cape. Nobody enjoys that walk.
Sizing is a common reason a dog coat disappoints, and it is fixable in five minutes with a soft tape measure. This guide covers whether your dog needs a coat at all, the three measurements that matter, how to read a size chart (including one quirk that catches people out), and which style suits which dog.
In this guide
The short version
Before you order
- Measure three things: back length, chest (called “bust” on many size charts) and neck.
- Use the chart on the exact product. An “M” in one listing is not an “M” in another (there is a real example below).
- If your dog is between sizes, size up. Several of our listings say sizing can run one to two sizes smaller than European and American sizes and that measurements can differ by 2–3 cm.
- Check the fit with two fingers under the chest, then watch your dog walk, sit and lie down.
Does your dog actually need a coat?
Not every dog does. Dogs with thick, dense coats often cope well with cold weather, while small, short-haired, very young, older or lean dogs tend to feel it sooner. Wet weather matters as much as the temperature, because damp fur loses warmth quickly.
Signs that your dog is cold include shivering, a hunched posture, lifting paws off the ground, slowing down or stopping on walks, and looking for warm spots. Every dog is different, and your vet is the right person to ask if your dog is a senior, has a health condition or you are unsure. For more on the question, see these guides from the American Kennel Club and Hill’s Pet.
How to measure your dog: three numbers, five minutes
You need a soft tape measure (or a piece of string and a ruler), a few treats and ideally a helper. Have your dog stand naturally on all four legs. Write every number down in both centimeters and inches (1 inch = 2.54 cm), since our size charts list centimeters.
Back length
Measure from the base of the neck, where the collar sits, along the spine to the base of the tail. Charts call this “back length” or simply “length.” A coat that is too short leaves the lower back exposed; one that is too long can get in the way when your dog goes to the toilet.
Chest (girth)
Wrap the tape around the widest part of the ribcage, just behind the front legs. Size charts call this “bust” or “chest circumference.” This is the number that decides whether a coat is comfortable, so measure it first and measure it twice.
Neck
Measure around the neck where a collar sits. You should be able to slide two fingers under the tape. Neck size matters most for coats with a fixed collar or hood and for anxiety-style jackets.
Tips: keep the tape snug but not tight, measure a fluffy dog over the fur (that is how they will wear the coat), and re-measure puppies every few weeks.
How to read a size chart (and the sizing catch)
Match the chest measurement first and the back length second. If your dog falls between two sizes, choose the larger one. Weight ranges are only a rough guide: a deep-chested dog and a barrel-chested dog can weigh the same and need different sizes.
Here is a real chart from one of our listings, the reflective pet raincoat, to show how it works:
| Size | Back length | Bust (chest) | Listed for weight |
|---|---|---|---|
| S | 20 cm | 32 cm | 1–2 kg |
| M | 25 cm | 37 cm | 1.5–3 kg |
| L | 30 cm | 42 cm | 3.5–4.5 kg |
| XL | 35 cm | 47 cm | 4.5–6 kg |
| XXL | 40 cm | 52 cm | 6–7.5 kg |
Worked example. Your dog measures 27 cm from neck to tail and 39 cm around the chest. The chest is bigger than the M (37 cm), so M would be tight. The L (42 cm chest, 30 cm length) leaves room to move. Choose L.
The sizing catch. Sizes are not universal, even inside one store. The M in the raincoat above has a 25 cm back length. The M in our winter pet sweater is listed at 32 cm. That is a 7 cm difference for the same letter. Always use the chart on the product page of the coat you are buying, and remember what several listings note: sizing can run one to two sizes smaller than European and American sizes, so choose the larger size if you are between two.
The fit check when it arrives
- Chest. Two fingers should slide under the chest area. If the fabric digs in, it is too small; if it gaps, it is too big.
- Shoulders and legs. Your dog should walk, trot, sit and lie down without the coat bunching or rubbing under the front legs.
- Length. The coat should cover the back up to the base of the tail without getting in the way of toileting.
- Harness access. If you walk with a harness, check that there is a leash hole or a design made for one. The picks below flag which ones have it.
The first week: let your dog sniff the coat, add a treat, and try five to ten minutes indoors before the first walk. Take the coat off when you come inside, because dogs can overheat indoors, and dry it after wet walks.
Which type of coat for which dog and weather?
| Type | Best for | What to look for |
|---|---|---|
| Knit sweater | Dry, mild cold and short walks; small or short-haired dogs | Stretch, a leash hole on the back |
| Padded waterproof coat | Wet snow and wind; medium and large dogs | Waterproof outer, padding, belly coverage, a full size range |
| Coat made for a harness | Daily walkers | Harness access without pulling the coat out of place |
| Hooded or fleece-lined coat | Small dogs and cold snaps | Snug hood, soft lining, easy on and off |
| Raincoat | Wet, windy days | Waterproof shell, reflective details |
Picks by situation
Every product below lists its own size chart, so measure first and compare the numbers on the page.
Medium and large dogs, wet snow
New Winter Dog Coat, Waterproof and Padded
A thick, padded coat built for bigger dogs, with a size range that runs far beyond the usual XL.
- Sizes XL to 6XL
- Listed with thick warm-keeping filling and a soft velvet inner layer
- Elastic belly and cuff design, described as helping the coat fit closer and reduce heat loss
- Four color combinations
Medium and large dogs, nylon shell
Winter Warm Dog Clothing, Waterproof Nylon
A waterproof nylon winter coat for dogs that spend time outdoors in snow.
- Waterproof nylon material
- Sizes XS to XXL
- Army green or black
For walkers who use a harness
Waterproof Winter Dog Coat With Harness
A winter coat listed with a harness, made for daily walkers who do not want to fight with layers on a cold morning.
- Rain-silk fabric
- Sizes XS to 4XL
- Seven color options
- Size chart on the product page
Small dogs
Hooded Dog Coat for Small Dogs
A cotton, hoodie-style coat listed for small breeds for autumn and winter.
- Cotton
- Sizes S to XXL
- Three colors: grey, khaki and military green
Mild days, with leash hole
Striped V-Neck Dog and Cat Sweater
A knit for cool days that thinks about the leash: there is an opening on the back for your collar or harness.
- Leash hole on the back for a collar or harness
- Elastic design that is easy to put on and take off
- Sizes XS to XL, in beige, light blue or red
Cold snaps
Autumn and Winter Fur-Collar Dog Coat
A layered coat for autumn and winter walks, with a fur collar.
- Made from a blend of polyester, cotton and fleece (per listing)
- Sizes XS to 2XL
- Five color options
Wet weather, large dogs
Large Dog Raincoat Jacket
When the problem is rain rather than cold, a raincoat in a very wide size range is what you need.
- Polyester raincoat
- Sizes S to 5XL with a bust and back-length chart
Keeping the coat working all season
Check the care notes on each product page, since fabrics differ. As a general rule, brush off snow and mud, let wet coats dry fully before storing them, and re-check the fit on growing puppies or dogs who have gained or lost weight.
Common questions
What if my dog is between two sizes?
Choose the larger size. A coat that is slightly big can be adjusted; a coat that is too small restricts movement and rubs.
Can I choose a size by my dog’s weight?
Use weight only as a rough cross-check. Chest and back length are the reliable numbers, because dogs of the same weight can have very different builds.
Should my dog wear a coat indoors?
Usually not. Take it off when you come inside so your dog does not overheat, unless your vet suggests otherwise.
How tight should a dog coat be?
Snug enough not to slide, loose enough to fit two fingers under the chest and to allow full leg movement.
Do puppies and older dogs need coats?
They can feel the cold sooner than healthy adult dogs. If your dog is very young, senior or has a health condition, ask your vet, and re-measure puppies as they grow.
What about a warm place to sleep?
A coat helps outdoors, but a warm bed matters just as much indoors. See our guide to warm dog and cat beds for winter.
Find the right fit
Measure first, compare with the size chart on the product page, and choose the larger size if you are between two. We offer free shipping, and estimated delivery is 7–10 business days after processing. See our Shipping Policy for details.
