Kennel clubs set their own standards. Hounds hunt all game except birds. Working dogs can do such jobs as herding farm animals, pulling sleds and carts, and guarding life and property. Terriers were once bred to ferret out rodents but are now bred as house pets.
Toys are tiny dogs bred mainly as pets.
Non-sporting dogs are those purebreds not included in the other categories. Some AKC-recognized breeds are illustrated here.