Looks like it should heal up ok. They are tough animals. Also, you should dilute the betadine before applying it. The surgeons at the hospital I work at dilute it with 30 parts water or saline to one part betadine. They say more than that can actually damage the tissue. Personally I wouldn't bother with putting anything on the wound at this point. I think it will heal fine either way and there is probably not much point in stressing him out applying anything.