Why Dog Clothes Don't Fit: The Five Problems I See Every Week

A woman in Mount Hawthorn once brought me a plastic bag with six coats in it. Six. All for one eleven-kilo cavoodle named Biscuit, and all of them wrong. She'd been buying online for two winters, and by the end of that appointment she wasn't asking me which coat to buy. She was asking whether she was bad at this.

She isn't, and neither are you. I fit pet clothing for a living out of the back of a converted ute around Perth, and the same five failures come across my folding table over and over. Nearly all of them are built into the way pet clothes are sold, not into the person holding the tape measure. Once you know what to look at, most of them are avoidable.

Problem one: buying on weight

Weight is the number everyone knows and the one that matters least. Two dogs can both weigh eight kilos and need completely different garments. A stocky French bulldog carries that eight kilos over a short back and a barrel chest. A whippet carries it over a long spine and a narrow ribcage. Same number on the scale, forty millimetres of difference in back length, and completely different chest depth.

I see this constantly with cavoodles and other small breeds, because littermates can diverge wildly and nobody re-measures once the dog stops growing. The fix is boring: put the dog on the scale at the vet, then put the tape measure on the dog and use that. Weight belongs in the "rough guide" column, not the decision.

Problem two: ignoring back length

People measure the chest, because that's the number that feels like it determines whether a coat goes on. Then they buy something that fits around the ribs and stops four centimetres short of the tail. On a long-backed dog it looks like a bolero jacket and it does nothing, because the panel that's supposed to sit over the kidneys and the lower back is sitting over nothing.

Measure from the base of the neck — where the collar sits, not the top of the skull — straight along the spine to the base of the tail. Have the dog standing square on a level floor. A dog standing with its head down and its back roached gives you a different number every time, which is half of why home measurements don't match the brand charts.

Problem three: armholes that rub

This is the one that gets a garment quietly retired after a week. The coat fits, the dog looks great in the photos, and then by Thursday there's a pink bald patch behind a front leg. Dogs don't limp or yelp about it; they just start refusing to walk when you bring the coat out.

The cause is usually an armhole cut that sits too far forward or too tight, so every stride drags fabric through the armpit. Run two fingers under the front leg and along the seam while the dog is standing. If you can't, or if the leg opening has any elastic in it, keep looking. Flat-felled or covered seams matter more than the outer fabric on anything worn for more than an hour.

Problem four: the twist

You put it on straight, the dog takes six steps, and the whole thing has rotated forty-five degrees so the velcro strap is now under her armpit. Owners assume the dog did something clever. Usually the garment is just fighting the shape of the dog.

Twisting happens when the chest piece and the back panel are pulling in different directions — the chest is tight and the back is loose, or the neck hole is sitting too low on the shoulders so there's nothing anchoring the whole thing. A garment with a decent high collar and two points of closure, one at the chest and one further back under the belly, almost always stays put. One single strap and one piece of velcro will wander on any dog who actually moves.

Problem five: no adjustment range

This is the quiet killer of online pet clothing. A coat with a fixed chest strap has maybe twenty millimetres of tolerance in it. Dogs don't come in twenty-millimetre increments, and their chest measurements shift with a grooming appointment, a season, a few weeks of swimming, or a change in brand of food.

Look for an adjustable chest strap on anything you're buying without trying it on. I'd take a plain vest with eighty millimetres of velcro adjustment over a beautiful tailored coat with none, every single time. It's also the reason I tell people to buy from an Australian retailer with a free size exchange policy rather than chasing the cheapest listing — you are going to get it wrong at least once, and the exchange is the product, not a bonus.

When it genuinely isn't you

I want to say this plainly, because I've watched people leave my ute feeling stupid. Some dogs are hard to fit and no amount of measuring fixes it. Deep-chested dogs with a narrow waist, dogs with one leg shorter than the others from an old fracture, brachycephalic dogs with a neck circumference larger than their head, senior dogs who've lost muscle along the topline — standard patterns just don't describe these animals.

If you've measured carefully twice and still struck out three times, the problem is the pattern, not your tape measure. That's the point where a made-to-measure or adjustable piece is the right call, and where a fitting appointment saves you the money you'd spend on the fourth attempt.

What I do now, every time

Back length, chest girth at the widest point, neck where the collar sits. All three written in my phone with the date, because Olive's measurements have changed twice since I started doing this. Then I compare against the brand's own chart rather than the generic size label, because a large from one manufacturer is a medium from another and the letters mean nothing across brands.

And if the dog lands between two sizes, I go up. Always. A garment that is slightly roomy can be taken in at the chest, pinned at the back, or adjusted with the straps. A garment that is too tight won't sit flat, will twist, and will rub. There is no fixing that one.

Biscuit went home in the second-cheapest coat in the bag with the straps shortened, and his owner rang me a week later to say he'd worn it every morning since. Six coats, one that worked. That ratio is far more common than anyone admits, and it isn't a reflection on you. — Maddie, Perth, back in the ute with a tape measure round my neck and dog hair in my coffee.

Frequently Asked Questions

Why don't dog clothes fit when I buy the right weight size?

Because weight does not describe shape. Two dogs of the same weight can have very different back lengths and chest depths, which are the two measurements that actually determine fit. Use back length, chest girth and neck circumference, and treat the weight guide as a rough starting point only.

My dog is between two sizes. Which should I pick?

Choose the larger size. A slightly roomy garment can be adjusted with straps, pins or minor alterations, and it will still sit flat. A garment that is too tight will not lie correctly, tends to twist while the dog walks, and can rub behind the front legs.

How do I stop a dog coat from twisting sideways?

Twisting usually means the chest and back are being pulled in different directions. Look for a higher collar that anchors the garment at the shoulders, plus two closure points rather than one. A wide adjustable chest strap with plenty of velcro overlap holds its position far better than a single fixed strap.

What should I look for in a fitting guide for small breeds?

Measure the back from the base of the neck to the base of the tail with the dog standing square, the chest at its widest point behind the front legs, and the neck where a collar would sit. Compare those three numbers to the brand's own chart, because size letters vary considerably between manufacturers.

Is it worth buying from a store with free size exchange in Australia?

Yes, particularly when buying online. Even with careful measurements, the first garment is often slightly off. An exchange policy turns that first miss into a normal part of the process instead of money wasted, and it matters more than saving a few dollars on a listing you cannot return.

Size & Fit Reference

General pet clothing ranges. Measure the back from the base of the neck to the base of the tail, and the chest at its widest point. Always check the brand's own chart.

Size	Back length	Chest girth	Neck	Weight guide	Typical breeds
XS	25–30 cm	32–38 cm	22–26 cm	1.5–3 kg	Chihuahua, kitten, small cat
S	30–36 cm	38–46 cm	26–30 cm	3–5 kg	Cavoodle, Pug, average cat
M	36–42 cm	46–54 cm	30–35 cm	5–9 kg	Cocker Spaniel, small Terrier
L	42–50 cm	54–64 cm	35–41 cm	9–16 kg	Kelpie, Border Collie
XL	50–58 cm	64–74 cm	41–47 cm	16–24 kg	Labrador, Greyhound
XXL	58–66 cm	74–86 cm	47–53 cm	24–34 kg	Great Dane, Mastiff

Between two sizes? Size up. A garment that is slightly roomy can be adjusted; one that is too tight will not sit flat and will not work.