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 they many be animals trained strictly to perform a job, such as logging elephants. They may also be used for milk, a job that requires human training to encourage the animal to cooperate. Some, at the end of their working lives, may also be used for meat or other products such as leather. Such animals are sometimes called beasts of burden.
The history of working animals may predate agriculture, with dogs used by our hunter-gatherer ancestors. Around the world, millions of animals work in relationship with their owners. Domesticated species are often bred to be suitable for different uses and conditions, especially horses and working dogs. Working animals are usually raised on farms, though some are still captured from the wild, such as dolphins and some Asian elephants.