He sported a braided leather headband and the curved tooth of a canine around his neck.

WSJ: Learning to Dog Sled in Bavaria, Germany

The training to open their mouths was key to staff spotting a rotting upper left canine bothering Arktos last year and a damaged tooth that troubled Walker in 2011.

BBC: How do you give a polar bear a 'medical'?

There are thousands of art collectors and dog fanciers around the world ready to fight tooth and nail in the dog-eat-dog world of canine collecting.

FORBES: Barking Mad