It is taken around the pet’s neck .Allow a bit of extra room for a comfortable fit.
It is taken around the dog’s girth at its widest point, all the way around, which is typically right behind the front legs. If the dog has a large girth, going up one size larger is better.
It is taken from the base of your dog's neck to the base of the tail. Some clothes should be within 2 to 4 inches from the base of the tail.