We all agree that pets cheer us up when we're feeling sad, but can they also tell when we're ill?!

Beamish, this Rottweiler, did just that when his increased attention to a mole convinced Chris Tuffrey to get it checked out. The pooch kept nuzzling, licking, and trying to lift his owner's arm and it turns out the mole was a melanoma . . . and needed to be removed.

There have been other cases and claims in which animals have reacted differently around illness and evidence that they can detect cancer, predict epileptic seizures, and more. What do you think – would unusual behavior from your dog cause you to visit a doc?