Pitbulldatabase.com

MALES:
Shepherd's Holliston Dog (black & Tan) x Collagan's Young Bitch COLBY'S BILLY
Shepherd's Holliston Dog (black & Tan) x Collagan's Young Bitch HOUGHTON'S PETE

FEMALES:
Shepherd's Holliston Dog (black & Tan) x Collagan's Young Bitch COLBY'S LILL