Fuzzy Tarantula Costume lets any dog be the scariest one on the block! The creepiest, crawliest, most hair-raising spider costume ever! Plush fabric resembles real spider hair; 8 bendable legs for multiple poses Back: Measure length of pet’s back from the base of the neck to the base of the tail. See below for estimating by breed.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 dog has a stout build, select one size larger. Size Chest Size Neck Size Length X-Small 15″ 9″ 8″ Small 16″ 10″ 12″ Medium 22″ 13″ 16″ Large 28″ 17″ 20″ Recommended Sizing By Breed X-Small Chihuahua, Yorkshire Terrier Small Jack Russell Terrier, French Bulldog Medium Beagle, Boston Terrier Large Boxer, Labrador Retriever