yep, I would have him inside for 3 nights minimum. First to make sure he is healing well, and second to make sure that predator doesnt return and cause more harm or stress.
take him inside to the bathroom and run a warm (not hot) bath and allow him to float and bath. Allow him warm baths daily until he is fully clean and wounds (you have yet to find) have healed. Calm, quite and inside in dog kennel or the like will be best for him so that the predator doesnt come...