Something Bit him right under the joint of his elbow. Probably nicked a tendon which made his limp worse but I'm told he'll be A-ok! No broken bones just slightly inflamed! He had a temp so he's on meds and they flushed out the bite which didn't impress him at all. But sweet baby that he is he didn't claw or bite at all... he even let them shave the injury sight without any fuss or struggle. He did however burry his head in my armpit when they took his temperature.
He's a BIT cranky and tired from the trip but he's ousted the dog from HIS bed so I think he's feeling better...and is curled up like a master Yogi, though still guarding the leg.

Thank you all!!