Puppy Bumper - Keep Your Dog on the Safe Side of the Fence - Holiday Snowman - 10"-13" Dog's own collar threads through loops to keep it in place. Light, comfortable, and machine washable. Don't take chances with your dogs. An accidental fall from a balcony or escape under a fence can have terrible consequences. Now your dog can be stylish and safe at the same time! Puppy Bumperspillow collars slip on over the collar and restrict their access to the smallest spaces. Holiday snowman design.