Oh...thats not cool. I really have no idea sorry but i feel for the big fella. Those drains are a bit ...ugh....Mojo ripped his one out !! My old Ridgeback used to get alot of lumps and bumps and he was lucky that none where cancerous. I hope Hooch has the same luck too. Thinking of you guys. Good luck and be sure to let us know how he goes. Fingers and paws crossed.