Wow, not knowing is pretty scary! So, y'all don't even know if it's an animal bite or anything? He was alone, though, huh? that's good that he was happy to see you! You couldn't have known what to expect. I'm glad he's home, though! I hate drains, too, my Bruno had them once, but, I didn't have to flush the wound, thank goodness. Good luck with helping him heal!