I'm glad she is doing better! It reminds me of a story that happened to me: Raustyk & my ex b/f's dog used to run around in circles. Well Raustyk could never catch Mylo so she would always try to catch him by running through the middle. She must of been really mad at not catching him because when she finnally got him she held on and ripped open his side too. Which looked exactally like your dogs gash. It healed fine & he was ok but I was nervous at first.