Humans (Homo sapiens) are one of the few species to enter into extended and

complex social relationships with other species. In some cases, such as the
milker with the cow, the shepherd and the dog, and the rancher with a horse,
this may involve staking one's food supply and income, well-being and life
on the trust and success of a close relationship (Lott and Hart, 1977). In the
social contract between caretaker and animal, it seems obvious that the
handler should acknowledge or reward all normal behaviour and likewise
discipline or ignore deviant or abnormal behaviour.

1. Animal roles 319
2. Cattle 1591