You found the perfect little jacket, it arrived, and somehow it is both too tight around the chest and too long in the body. Sound familiar? Dog clothing sizing is notoriously inconsistent between brands, and "small" can mean wildly different things. The fix is simple: measure your dog once, write the numbers down, and check them against each item's size chart. Here is how.
What you will need
- A soft fabric tape measure, or string you can lay against a ruler
- A helper or a few treats to keep your dog standing still
- Your dog standing squarely on all fours, not sitting
The three measurements that matter
1. Back length
Measure from the base of the neck, where a collar sits, to the base of the tail. This is the most important number for tops, coats, and dresses. Too long and it bunches; too short and it rides up.
2. Chest or girth
Measure around the widest part of the chest, just behind the front legs. This decides whether the garment closes comfortably. Deep-chested dogs especially need to watch this one.
3. Neck
Measure around the base of the neck where a collar would sit. This matters for collared shirts, hoods, and turtlenecks.
Write all three down, plus your dog's weight as a backup reference.
A light, breathable everyday tee, a great first layer to practice measuring and fit on.
Shop nowHow to use a size chart
- Always check the specific item's chart, never assume your dog is a universal "medium."
- Match back length first, then confirm the chest girth fits.
- If your dog is between sizes, size up, since a touch loose beats too tight.
- For deep-chested or stocky breeds like bulldogs and pugs, prioritize the chest measurement.
A cozy knit where back length really matters, a perfect example to size carefully before buying.
Shop nowBreed quirks to watch for
Picture trying to fit a standard "small" coat on a dachshund: the length is right but it gulfs around a barrel chest, or the reverse. Long-bodied breeds like dachshunds and corgis often need a longer back length than their weight suggests. Deep-chested breeds like greyhounds and boxers need extra girth room. Flat-faced breeds may need wider neck openings. When in doubt, prioritize the measurement that is hardest to adjust.
An adjustable safety vest for low-light walks, easy to fit over other layers once you know your numbers.
Shop nowCommon mistakes
- Measuring a sitting dog, when you should stand them up.
- Pulling the tape tight instead of comfortably snug.
- Guessing by weight or breed alone.
- Forgetting to re-measure growing puppies.
Check the fit when it arrives
A good-fitting garment lets your dog walk, sit, and squat freely, does not rub the armpits or restrict the neck, and stays put without sliding. Trying to decide if your dog even needs a layer? See our guide on whether your dog needs a winter coat. Ready to shop? Browse all pet clothing and everything for your dog. A portion of every order supports shelter pets.