He did it this morning, but we don't know how. He was out running with the kids on our acreage. The bleeding stopped on it's own. He seems content to just lie down right now. It's not at all that deep, just raw, and I'm sure very sore. Our vet is closed for the weekend, but I do know of a 24 hour vet clinic about 20 miles away. I'd like to avoid going if I can because it's expensive, but I will take him in if he doesn't seem to improve quickly.