I was just petting him and I found a large-ish lump on his cheek. About the size of a golf ball but flatter. Any ideas what it could be? My dad said he got into a little fight at the dog park the other day (like 2-4 days ago) and said it might be from that. I just noticed it now though, and I am always holding his snoot and giving kisses, so I think its recent. Please any ideas welcome. If its still there in 2 days he's off to the vet.