premise: A working animal are incapable of being kept by anyone.
hypothesis: A pet or companion animal is an animal kept primarily for a person 's company , protection , and/or entertainment rather than as a working animal , sport animal , livestock , or laboratory animal . Wild wolves are sometimes kept as exotic pets , and in some rarer occasions , as working animals . A working animal is an animal , usually domesticated , that is kept by humans and trained to perform tasks . Working animals are usually raised on farms , though some are still captured from the wild , such as dolphins and some Asian elephants . Finally , small domestic pets such as most birds ( other than certain types of pigeon ) or hamsters are generally incapable of performing work other than that of providing simple companionship .