Pet rats (also known as fancy rats) are a domesticated breed of Rattus norvegicus. Bred as pets since the late 19th century, pet rats can be trained to use a litter box, come when called, and perform a variety of tricks. They are clean, sociable, playful and intelligent animals that love human company and attention when properly looked after. They have as little in common with their wild relatives as the average family dog does his cousin the wolf. Well kept rats will live about 2 to 3 years, although the oldest rat on record is said to have lived over 7 years. In short rats make ideal pets for almost anyone and rat care is easy with a little knowledge.