Puppia Lattice Dog Harness Soft, air-mesh harness comfortable for any dog Resizeable chest belt ensures a snug fit for your dog Matching nylon leash sold separately Sizes run small. In general, XS = Baby Yorkie/ Chihuahua, S = Yorkie, M = Maltese/ French Bulldog/ Beagle, L = Shih Tzu/ Mini-Schnauzer/ Cocker Spaniel, XL = Bichon Frise/ Pug/ Fox Terrier, XXL = doigs up to 55 lbs