Pocket Dog Parka by Dogo - Green - X-Large Faux fur trimmed hood, fleece lining Mock-neck sweater collar, leash hole Removable pocket, Velcro closure X-Large /inches (Length 15-1/2 to 18-1/2, Neck 13-1/2 to 15-1/2, Girth 20 to 23) If your dog is stouter, you should follow the size according to the girth, always round up to the next larger size if your measurement is near or over the maximum range in the smaller size, or you pet has a broad chest, wide underside, or thick coat.