A pet is an animal that is kept for companionship and enjoyment. The most popular pets are noted for their loyal or playful characteristics or for their attractive appearance or song. Pets can provide their owners with many health benefits. The keeping of pets has been shown to help remove stress. Walking a dog can also provide its owner (as well as the dog) with exercise, fresh air, and the opportunity for social interaction. (http://en.wikipedia.org/wiki/Pet)