Quick Release Buckle collars are the most common type of collar available to dog owners. Hound Lines quick release collars are made with an aluminum buckle instead of plastic for extra strength, durability and a polished, classic look. Our quick release buckle collars are adjustable in size. To measure your dog’s neck, we recommend using a soft measuring tape ,around where the collar sits and adding two inches to this measurement. When fitting this type of collar for your dog, you should be able to fit at least two fingers between the collar and your dog’s neck for it to fit comfortably.