Ultra Paws One Harness Product SheetFitting InstructionsChoosing the correct size:
These harnesses are highly adjustable and there are only 3 sizes to choose from. To get the best fit, measure your dog's neck size (collar size) and go off of that. There are also corresponding weight estimates (see below)...Small
fits a collar size of 8-14 inches and under 30 lb in weightLarge
fits a collar size of 12-24 inches and 30 to 75 lb weightHuge
fits a collar size of 20-34 inches and 75 to 120 lb weight.
**If the dog fits into a collar size in two different sizes, use the weight guide to help pick out the correct size harness.