This one's for the t-force:
The Straight Dope Mailbag: The Straight Dope Mailbag: Is it true many New England cats have extra paws because Boston ships' captains considered them lucky?:
"Turns out there is a polydactyl dog, too. The Lundehund, one of the oldest and rarest breeds of dogs, has six toes on each foot, which apparently helped it climb steep scree slopes. Lundehunds were bred to hunt puffins (lunde = puffin) for Norweigan fishermen on the Lofoten islands. This dog, among other unusual characteristics, has one less tooth on each side of its jaw."