Update on the pup: the vet narrowed it down to an infection in his GI which he probably caught after getting loose on the 27th and ended up going into a farm area with machinery. We have medicine for the bloody stools and infection and medicine for the diarrhea. He's on a bland diet again with rice and boiled meat. He's not drinking water which worries me so I have a syringe to make him drink water. He doesn't like his tail touched (even by me) so when the vet went to grab him (after I told her about the tail) for his temperature he turned around to nip her and poor guy ended up being muzzled the entire visit, which has never happened before. He just finished his food and took his meds and now is sleeping. Hopefully we'll see more improvements this weekend.