The right size makes a harness comfortable, a collar safe and a coat warm. Measure your dog with a soft tape measure, enter the number above and the finder shows the size that usually fits. Weight alone is not a reliable guide, because two dogs of the same weight can have very different chests and necks.
How to measure your dog
- Neck girth (collars): measure around the middle of the neck, where a collar sits. Keep two fingers between the tape and your dog.
- Chest girth (harnesses, coats and sweaters): measure around the widest part of the rib cage, just behind the front legs.
- Back length (coats): measure from the base of the neck to the base of the tail.
Ask your dog to stand straight and calm while you measure, and measure twice. A fluffy coat can add an inch, so press the tape gently through the fur.
How a good fit feels
- You can slide two fingers under the collar or harness strap, but it cannot slip over your dog’s head.
- The harness does not rub behind the front legs and does not press on the throat.
- A coat covers the back and chest without pulling when your dog walks or sits.
Between two sizes?
Choose the larger size and adjust the straps. Puppies grow fast, so check the fit every couple of weeks.
Typical size ranges
| Size | Harness chest (in) | Collar neck (in) |
|---|---|---|
| XS | 12–16 | 7–10 |
| S | 16–21 | 10–14 |
| M | 21–27 | 14–18 |
| L | 27–33 | 18–22 |
| XL | 33–40 | 22–26 |
| XXL | 40–46 | – |
These are general ranges. Every product has its own chart on its page, so check it before you order. Not sure which harness style to choose? Read our dog harness guide, or see typical sizes in our dog breed size chart. Ready to shop? Browse dog harnesses and dog collars.