Most UK dogs don't need a coat for warmth in October — but by December, a lot of them do. The trouble is that "dog coat" covers quilted jackets, fleece suits, raincoats, drying robes and knitted jumpers, and those are five different products solving five different problems. Buy the wrong one and it either doesn't keep your dog warm or doesn't survive a wet field.
This guide sorts out which type you actually need, how to size one properly, and how to make a coat work with a harness rather than against it. It's written for British weather specifically — cold, grey and damp far more often than it is snowy.
Does My Dog Actually Need a Coat?
Some dogs genuinely need one and some genuinely don't. Thin-coated, small, elderly, very young and short-haired dogs lose heat fast and benefit from a coat once temperatures drop into single figures. Thick double-coated breeds — huskies, malamutes, many collies and shepherds — carry their own insulation and usually don't.
The honest test isn't a temperature chart, it's your dog. Shivering, hesitating at the door in cold weather, lifting paws, or turning for home early all suggest they'd be more comfortable with a layer. A dog who charges out happily at 2°C and comes back steaming does not need one.
Size matters more than most people expect. A chihuahua has far more surface area relative to body mass than a labrador, so it loses heat faster in the same conditions. That's why the smallest dogs and the leanest ones — whippets, greyhounds, Italian greyhounds — are the most likely to need a coat regardless of how fit they are.
Age cuts both ways. Puppies regulate temperature poorly and tire quickly; older dogs lose muscle and often have stiffer joints that cold makes worse. Both groups feel the benefit sooner than a healthy adult dog of the same breed.
The Five Types of Dog Coat, and What Each Is For
| Type | What it does | Best for | Limitation |
|---|---|---|---|
| Quilted coat | Padded water-resistant shell with a warm lining | Cold, damp, everyday UK walks | Not a full waterproof for sustained heavy rain |
| Fleece suit or jumper | Fleece throughout, often covering legs and belly | Muddy dogs, long-bodied breeds, wicking a wet dog dry | Soaks through in real rain; less wind resistant |
| Waterproof raincoat | Thin fully waterproof shell | Sustained heavy rain | Little warmth on its own |
| Drying robe | Absorbent towelling worn after a walk | Post-swim, post-bath, soaked dogs | Not walking kit |
| Knitted jumper | Soft indoor warmth | House, garden, car journeys | No weather protection at all |
If you only buy one thing for a British winter, buy the quilted coat. It covers the most common conditions by a wide margin — cold and damp rather than cold and soaking — and a fleece-lined one gives you warmth and weather resistance in a single layer.
Water-Resistant or Waterproof?
This is the distinction that causes the most disappointment, so it's worth being precise. Water-resistant means the fabric sheds water for a while: drizzle, wet grass, a passing shower. Waterproof means water doesn't get through, usually via a membrane or coating, generally with taped seams.
For most UK walks, water-resistant is the right choice. A typical British winter walk is forty minutes of grey damp, not an hour in driving rain, and a water-resistant quilted coat handles that while also being warm — which a thin waterproof shell isn't.
Our full comparison of waterproof vs water-resistant dog coats goes through the trade-off in detail. Where waterproof wins is sustained exposure: a long hike in steady rain, or a dog who spends the walk swimming. And there's a catch worth knowing — once any coat is thoroughly soaked, it stops helping and starts hurting, because wet fabric held against the skin conducts heat away. On those days the better plan is a shorter walk and a proper dry-off afterwards rather than a heavier layer during.
How to Size a Dog Coat
Measure back length, from the base of the neck to the base of the tail, and size to that. It's the one measurement that can't be adjusted away — the length of the panel is fixed, while neck and chest fastenings have adjustment built in. Our measuring guide shows the technique.
Don't size by breed. The spread within a breed is wide enough that two cockapoos can need different sizes, and breed-based sizing is the single most common cause of a returned coat.
A coat that's too long is as much of a problem as one that's too short: it interferes with toileting and catches when your dog squats. A coat that's too short leaves the lower back exposed, which is exactly the area you were trying to cover. Between two sizes, go up — that leaves room for a harness or a thin fleece underneath on the coldest days.
| 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 |
Coats and Harnesses: Get the Order Right
If your dog walks in a harness — and most dogs who pull, or who carry a collapsing-trachea or spinal risk, should — the coat has to accommodate it. There are two workable arrangements and one to avoid.
Harness first, coat over the top is the better default, provided the coat has a lead opening on the back. The harness sits directly against your dog, so the fit you set is the fit you keep, and you can use a genuinely warm coat without any of it interfering with the lead.
A slim fleece first, harness over the top works when the coat has no opening. Only use it with thin fabric, and loosen the harness slightly to account for the layer.
Never clip the lead to a loop on the coat itself unless the maker states it's load-rated for walking. Many such loops are stitched to the outer fabric only and can tear away under a sudden lunge.
Our full breakdown is in dog coats that work with a harness, including how to check an opening actually lines up with your harness's D-ring.
Coats by Breed and Body Shape
Long-backed dogs — dachshunds, corgis, basset hounds. Back length decides everything here, and these dogs are often in a harness for spinal reasons, so a lead opening matters more than usual. See our guide to dog coats for dachshunds.
Deep and barrel-chested dogs — French bulldogs, pugs, Staffies, whippets. A fixed-size coat tends to pull across the chest; adjustable fastenings are what make these shapes workable.
Curly-coated dogs — cockapoos, cavapoos, poodles, bichons. A wet curly coat takes hours to dry, so a water-resistant outer saves a lot of damp-dog smell.
Thin-coated and lean dogs — whippets, greyhounds, Italian greyhounds, chihuahuas. The group most likely to genuinely need a coat, and the group that feels the benefit fastest.
Puppies — thin coats, poor temperature regulation, growing fast. Size for the dog you have now rather than the one they'll become; a coat that's too big slides around and does nothing. See our puppy coat guide.
Double-coated breeds — huskies, malamutes, many collies and German shepherds. Usually no coat needed. Adding one can make them uncomfortably warm on a brisk walk.
Caring for a Dog Coat
Wash it more often than feels necessary — mud and grit work into the fabric and wear it from the inside. Machine wash at 30°C and air dry naturally.
Avoid the tumble dryer and the radiator. Direct heat flattens a fleece lining permanently, so a coat that was warm in November is noticeably less so by February. The same heat degrades a water-resistant finish, which is why coats often seem to "stop working" after a season — usually it's drying, not the fabric.
For a dog who comes home genuinely soaked, a drying robe does the job far better than leaving a wet coat on. See our guide to dog drying robes.
Our Quilted Dog Coats
Our quilted dog coats are built for the conditions described throughout this guide: a water-resistant quilted outer, a teddy-fleece lining for genuine warmth, adjustable velcro at neck and belly, and a lead opening so the coat wears over your dog's harness.
Foxbury Plaid is a classic autumn tartan and part of a full matching range — harness, collar, lead, poo bag holder and sailor bow in the same print.
Khaki Tweed has tweed collar and chest-strap detailing over a khaki body, which hides mud far better than anything pale.
Both come in XS, S and M, and both machine wash at 30°C. Foxbury Plaid also appears across our harness bundles, if you want the harness, collar and lead underneath the coat to match it.
Shop dog coatsFrequently Asked Questions
At what temperature does a dog need a coat?
There's no single number, because it depends on coat type, size, age and health. As a rough guide, thin-coated and small dogs feel the cold below about 10°C, and most dogs that benefit from a coat will show it below 5°C. Watch your dog rather than the thermometer.
Do dogs need coats indoors?
Rarely. A dog who shivers indoors is usually elderly, unwell or very thin-coated — worth a vet conversation rather than a coat.
Can a dog wear a coat with a harness?
Yes. Put the harness on first and use a coat with a lead opening on the back, so the lead clips through to the D-ring without removing anything.
How do I measure my dog for a coat?
Back length, from the base of the neck to the base of the tail. Match it to the size chart rather than choosing by breed.
Are quilted dog coats waterproof?
Water-resistant, which covers drizzle, wet grass and passing showers. For a full day in steady rain you want a dedicated waterproof.
Will a coat make my dog overheat?
It can on a mild day or a brisk walk. If your dog is panting heavily early on, take it off — overheating is the more common mistake once owners have bought a coat.
How often should I wash it?
Whenever it's visibly muddy. Grit left in the fabric wears it out faster than washing does.
My dog hates wearing a coat — what now?
Build it up indoors in short sessions with treats, starting with the coat just resting on their back before fastening anything. Most dogs object to the putting-on rather than the wearing, which is why velcro fastenings tend to be better tolerated than anything pulled over the head.
