Pitbulldatabase.com

MALES:
Colby's Billy x Colby's Belle (1928) COLBY'S BLIND JACK
Colby's Billy x Colby's Belle (1928) COLBY'S GULLY (3XW-1XL)

FEMALES:
Colby's Billy x Colby's Belle (1928) COLBY'S JILL I