A former veterinary nurse has said her dog saved her life by detecting cancer in its very early stages. Colleen Ferguson, 70.

"She is truly such a smart, special dog, and I love her so much," Hoornstra said.

A husky named Kobe would not stop digging at the same patch of ground outside his Philadelphia home. It was not playful or random. He returned to the spot again and again, focused in a way his owner ...