Two Labradors grace the front steps of the main house at Shawnee Farm. Their dark coats glossy in the sunlight, the affable mother-daughter pair are among the eight generations of hunting dogs bred by G. Watts Humphrey Jr. and his wife Sally. As much as the sport of horse racing has been an unwavering passion for the Humphreys throughout their many years together, so too has their shared penchant for bird hunting. In fact, the sport led them into forming a business relationship that evolved into a lifelong friendship--one that...