Pet collars come in a variety of styles. There are some that are made of nylon, others that are made of links, and still others that are battery operated. You will always be able to find a collar that is suitable for your pet's breed. Even if you've gotten used to letting your dog roam around or walking your dog without it and a leash, it's still a good idea to get one for your dog because these products also consider the pet's safety.