Dog

Normal dogs include most medium and large breeds, including wild dogs. After biting an opponent, a dog can hold on until killed or until the victim spends an attack breaking free.
Riding dogs are a large breed, used primarily by Halflings for transport. They may be trained for war, and equipped with barding to improve their Armor Class. They can maintain a hold in the same way that normal dogs do. A light load for a riding dog is up to 150 pounds; a heavy load, up to 300 pounds.