Double merle Australian Shepherds, Collies, and other merle breeds have high rates of deafness and blindness from pigmentation gene interactions.
Double merle dogs born deaf and blind face significant welfare challenges navigating a world they cannot fully sense. While many adapt well, the unnecessary production of disabled dogs through predictable genetic outcomes is ethically problematic. Responsible breeding avoids merle-to-merle pairings, preventing these outcomes entirely. Rescue and appropriate placement of existing double merle dogs ensures they receive the specialist care they need.