Size L measures 19-21" L, 15-17" neck and 24-26" girth Size XL measures 24-26"L, 18-20" neck and 26-30' girth Size XXL measures 27-28" L, 21-23" neck and 32-35" girth Other sizes available, email us at fit4apit@gmail.com Need help figuring out which size to order? Not sure how to measure? Please visit our SIZING INFO page for measuring diagram, a short video and even a printable measuring tape in case you don't have one! Still not sure which size to order? EMAIL US your dog's weight, length and girth and we'll let you know whether to size up or down.