Firstly, do not attach a seat belt to your dog’s collar as it could cause choking or serious neck injuries to your pet in the event of an accident. Instead, attach the seat belt to your dog’s harness. Also, never leave your dog seat belt hanging from your pet’s harness. Always make sure that the other end of the strap is properly attached to the back seat. When detaching the dog seat belt, always unlock the end that attaches to your dog’s harness.