Large animal! Steer (pun intended) clear! Baytril is a good choice for guesswork abo's, I would stick with that until you get a culture done. How much does your snake weigh to the closest 100 grams? He should receive a shot IM once every 5 days for 25 days diluted at least 1:1 with saline to reduce instance of scale necrosis. I agree with the others, isolate.