Domestication
Domestication is the act of submitting one species to become the pets of another. Traces of domestication can be found as far back as prehistoric times.
Contrary to popular belief, size and strength do not determine whether a species can be domesticated by another. The passive nature of some larger animals can make them the pets of another.
Ambiguity of domestication
What makes one species the pet of another is not very clear, an individual must submit to the will of another, or accept the idea that he is inferior to it as a being.