PROTECT YOUR PET: The KeepSafe Break-Away Collar is the only collar with a patented buckle specially designed for quick release to help prevent tragic collar accidents STURDY, REUSABLE BUCKLE: The unique break-away buckle design separates when pressure is applied if the collar becomes caught or snagged; it easily snaps back together so it can be used again and again. A separate traditional snap buckle allows the collar to be put on and taken off easily WORKS WITH WALKS: Two metal D rings located on either side of the break-away buckle let you easily secure the KeepSafe Collar when walking your dog; fasten the lead to both D rings to prevent the collar from breaking away during lead walks PERFECT FOR PLAYTIME: Many collar mishaps occur when two or more dogs are playing together at home or at the park ? jaws, paws or claws become snagged in a collar; the KeepSafe collar can help prevent playtime accidents for your dog and his buddies EASY REPLACEMENTS: If your KeepSafe Break-Away Collar ever becomes damaged due to chewing or scratching, contact PetSafe?s U.S.-based Customer Care Center and a replacement can be sent for a small fee SIZE INFORMATION: Medium 2.5 cm collar: Adjustable 35.5 - 50.8 cm length; 2.5 cm width; If you?re having trouble fitting the KeepSafe collar, please contact PetSafe?s U.S.-based Customer Care Center for help before returning your purchase EXPERIENCE: PetSafe brand has been an industry leading U.S. manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year