"Even people who care about animals are often unable to recognize or meet animals' many needs. Domesticated animals are in a catch-22 situation--they can no longer survive on their own, yet they retain many of their basic instincts and drives. Usually, they are isolated from their natural packs. Their bodies and souls yearn to roam--but, for safety's sake, they are confined to a house or yard, always dependent on their guardians, even for a drink of water, food to eat, or social contact."
Peta.org Factsheet