premise: A working animal is anything but an animal.
hypothesis: A working animal is an animal , usually domesticated , that is kept by humans and trained to perform tasks . They may be close members of the family , such as guide dogs or other assistance dogs , or they may be animals trained to provide tractive force , such as draft horses or logging elephants . The latter types of animals are called draft animals ( draught animals ) or beasts of burden . Most working animals are either service animals or draft animals . Several animals including camels , donkeys , horses and dogs are used for transport , either riding or to pull wagons and sleds .