It did not take Man long-probably not more than a hundred centuries-to discover that all the animals except the dog were impossible around the house. One has but to spend a few days with an aardvark or llama, command a water buffalo to sit up and beg or try to housebreak a moose, to perceive how wisely Man set about his process of elimination and selection.

Thurber's dogs (ed. Fireside, 1955)