Not just big, but big-hearted and mellow, it's time to meet these magnificent mastiffs from around the world. After loving 19 cats, 11 dogs, and a canary, Tracey married someone allergic to all those ...

Spot the mouse, for that is her name, lived a hairless life — until nine months ago, when she suddenly gained a tuft of human hair on one side. Spot is a test subject for Silicon Valley startup dNovo, ...