What was the name of Paul Bunyan's dog?

His exploits revolve around the tall tales of his superhuman labors, and he is customarily accompanied by Babe the Blue Ox.

Sport was a reversible dog.He was part elephant dog and part wolf. He was raised on bear milk. When he was a puppy Paul was working in the barn. Out of the corner of his eye he saw a rat and threw his axe at it. Too late he realized that it was actually Sport.

Very quickly he stuck the two halves together and taped him up. Sport healed well but Paul had put one end up and the other down. When his front paws were on the ground his back paws were in the air. Sport could run for long distances because when one end got tired he simply flipped over and used the other end.