On The Keeping of Pets

The practice of keeping animals regardless of their usefulness, the keeping, exactly, of pets (in the 16th century the word usually referred to a lamb raised by hand) is a modern innovation, and, on the social scale on which it exists today, is unique. It is part of that universal but personal withdrawal into the private small family unit, decorated or furnished with mementoes from the outside world, which is such a distinguishing feature of consumer societies. 

- John Berger