Bison is an incredible and prolific stud. His pups are strong, powerful dogs who love running, just as he is. He's a leader and has a good percentage of leader offspring. Bison is ALL HEART and has his own profile in ADN:
https://www.adn.com/outdoors-adventure/iditarod/2020/03/14/meet-the-dogfather-who-has-several-pups-racing-in-this-years-iditarod/