Back~ Measure length of pet’s back from the base of the neck to the base of the tail. Neck~ Measure the circumference of pet’s neck for a snug fit.  No need to add inches as you would with a collar. Chest-Girth~ Measure girth around the broadest part of the chest and add 2”.  Note: If the measurement is between sizes or if the dog has a stouter build, select one size larger for a proper fit.

Size	Fits Length	Fits Necks	Fits Chests
X-Small	Up to 8"	10"-12"	14"-18"
Small	8"-12"	12"-16"	18"-23"