How to Choose the Right Dog Hoodie Size? | Fit by Chest, Not Weight

For the full breakdown, see our best Dog Hoodies guide.

Picking the right dog hoodie size stops being a guessing game the moment you grab a soft tape measure. Weight alone will fail you — a stocky 20-pound Frenchie and a leggy 20-pound terrier need completely different hoodies. The reliable way to choose the right dog hoodie size involves three body measurements taken while your dog stands naturally, compared against the specific hoodie’s chart rather than a generic one.

The Three Measurements That Matter

Take all three measurements with your dog standing squarely on all four paws — not sitting, not stretching. Use a cloth tape measure and keep it snug but never tight.

• Chest girth: Wrap the tape around the widest part of the chest, just behind the front legs. This is the single most important number for hoodies.
• Back length: Measure from the base of the neck down to the base of the tail.
• Neck girth: Measure around the neck where a collar naturally sits.

Chewy’s fitting guide recommends you should be able to fit two fingers between the tape and your dog’s body — that gap is the comfort margin that keeps the hoodie from restricting movement.

Reading the Size Chart Correctly

Here’s where most buyers trip up: dog hoodie sizes are not standardized across brands. A “Large” from one manufacturer can fit like a “Medium” from another, and charts mix inches and centimeters depending on where the brand is based. Always match your measurements against the exact product’s size chart, not a generic dog-size guide.

PetSmart’s dog clothes sizing chart is a solid retail reference for comparing your dog’s measurements against lettered sizes, but every hoodie listing carries its own specific chart — trust that one first. If your dog’s measurements fall between two sizes on the chest girth column, size up and consider your dog’s body proportions so the hoodie doesn’t ride up across the shoulders.

Common Sizing Mistakes to Avoid

Four errors cause nearly every ill-fitting hoodie, and each is easy to fix:

• Relying on weight alone. Body shape varies wildly within the same weight class — measure, don’t guess.
• Measuring a moving target. A dog that’s sitting, wiggling, or lying down gives skewed numbers.
• Pulling the tape tight. Leave that two-finger gap for breathing room and comfort.
• Ignoring coat volume. Fluffy or long-haired dogs need extra allowance for fur, so size up if your dog runs fluffy.

Fit also varies by breed and body proportions — a deep-chested dog and a long-backed dog of the same weight will need different sizes. When in doubt, the guides consistently recommend sizing up for chest girth so the hoodie never restricts movement. If you’re weighing options across brands, our roundup of the best dog hoodies on the market can help you compare fits side by side.

Sizing a Dog Hoodie: The 5-Step Order

The whole process takes about three minutes once you have a tape measure in hand:

1. Measure chest girth at the widest point behind the front legs, dog standing.
2. Measure back length from the base of the neck to the base of the tail.
3. Measure neck girth where the collar sits.
4. Compare all three against the specific hoodie’s own size chart, preferring the chest girth column when numbers conflict.
5. Size up for fluff or borderline fits, and double-check the neck opening — you want room for two fingers there too.

When the hoodie arrives, do a quick test: your dog should walk, sit, and raise their tail without the fabric pulling tight across the chest or riding up the back. Chewy’s dog clothing measurement guide walks through the same steps with visuals if you want a second reference. A hoodie that’s too tight restricts movement; one that’s too loose slips and becomes a tripping hazard — the two-finger rule at every measuring point keeps you in the comfortable middle zone.