The product description1. Size: The puppy bumper is based on your dog's neck size, not their collar /2. Peace of mind: Your pet can now go to the bathroom on his own without sneaking through your yard fence or staying safely on the balcony of your high-rise apartment because he wears his comfy, lightweight puppy bumper plush collar.3. Free for your pet: Instead of expensive modifications to your fence or keeping your pet on a leash in the yard or patio, puppy bumper fill dog collar lets your puppy run, jump, play and explore Your pet will love the freedom.4.Safe and comfortable: machine washable. Made of 100% cotton material filled with polyester fiber, the original puppy bumper has a ribbon loop inside the neck hole that allows the puppy bumper to connect to the collar (collar not included) to prevent it from being pushed over the dog's head.