Known as man's best friend, dogs are first choice pets for many families and individuals. Domesticated as early as 15,000 years ago, dogs have played companion to humans for eons. As workers and guides, lap-companions or hunters, dogs have filled many helpful roles in society. No other mammal has such a human following. Dogs and people benefit from the mutual appreciation they have for each other. Fascination with various breeds may come and go, but dogs are here to stay as our best-loved pets.