International Sheep Dog Society United States Border Collie Handlers Association San Joaquin Valley Border Collie Association Oregon Sheep Dog Society Redwood Empire Sheepdog Association Canadian Border Collie Association Texas Sheepdog Association Intermountain Stockdog Association Mountain & Plains Border Collie Association Border Collie Rescue of Northern California Oklahoma State University Sheep Breed Pages ISDS Border Collie Database (private, not affiliated with ISDS) Mosquito and Vector Control Association of California UCSF Canine Behavioral Genetics COMMERCIAL SITES Border Collies in Action Operation Sheepdog Herding Premier Sheep Pipestone Sheep Supplies