Sizing InfoTHESE COLLARS ARE HEAT SEALED AND NOT ADJUSTABLE PLEASE MEASURE YOUR DOGS' NECK CAREFULLY To determine the correct size: Measure your dog's neck at the point where the collar should rest with a soft measuring tape pulled snug but not tight, then add 1 inch. OR Measure your dog's existing snap buckle collar laid flat from the end of the buckle to the other end not including the prong part of the clasp. If you use a regular buckle collar with the collar laid flat measure from the end of the buckle to the buckle hole used. If you are still unsure of what size to order, please contact us. We are always happy to help with sizing questions. | |||||