The Zep-Pro Dog Collar Nylon is an adjustable pet collar. It comes beautifully designed with a Tuna pattern. The Zep-Pro “Pet Classics” incorporates unique styling and functionality to produce a truly personalized and elegant line of pet collars and leashes. To assure a safe and comfortable fit for your pet, please read the following instructions carefully. To measure your pet’s neck, place two fingers between the neck and the measuring device and note the indicated length