I wouldn’t say it’s deep by any means, but it is kinda big. It’s more superficial. I can feel the swelling going down, at least on the bottom it does. This is the best picture I could get of it. He is standing on it more and has been crowing ALL dayNo heat is great as heat usually means infection or tissue injury. Have you tried cleaning out the open area with a syringe full of saline? It'll ensure there's no debris in there to create a breeding ground for infection and help you get a better look at what's going on. Is it a deep wound?
