We know they look like they're trying to put out some fires on their walk, so it can't hurt to look the part, right?

Measure the length of your dog's back from the nape of the neck to the base of the tail. Costumes do not have the same fit and give as a sweater, so if the measurement is between sizes, or if the pet has stout build, choose a garment in the next size.

Small - 10-13"
Medium - 14-17"
Large - 18-22"