Final answer:
Companionship is a true and common feature of a pet, where pets form emotional bonds with humans across various cultures.
Step-by-step explanation:
A common feature of a pet is companionship. Companionship is among the primary reasons many individuals choose to have pets. This notion is supported by various cultural contexts, where pets serve not just as animals in the household but as companions with whom humans develop significant emotional bonds. Whether in the West, where there is often a sentimental relationship with pets, or in other cultures that may perceive the roles of pets differently, the theme of companionship is recurrent. Thus, to say that a feature of a pet is companionship would indeed be true.