Measure across top of paw, including all paw to get the right fit. If in doubt, get the next larger size. The Sock has a soft elastic loop which holds the sock in place for hands free grooming. Slip the sock over the paw, mesh side under paw. Gently guide each nail through it's own hole. Clip or grind then remove.The Sock can be damaged by the rotary tool, as it can tear a hole in it. DO NOT use damaged sock. Once a hole is larger than the nail, it will allow hair through and it will get caught in the grinder.Machine wash and dry.The sock can also be used to protect paws when medicine has been applied to the paw to prevent licking.Sock is made and packaged in the USA.