I dont know about a leopard but our white bunny sure does seem to be managing it! Its not so clear in the photo above- him being white makes it hard to get a good picture of him. But the few dark hairs he had on his face are spreading. I thought it was a smudge of dirt the other day but it keeps growing. Now they have gone really dark and are in a heart shaped pattern. You can just barely make it out in the photo, but I promise in real life its really obvious. His way of wearing his heart on his sleeve I guess!