My daughter's cat is very ill. I took him to the vet on Monday. He was falling over, and was drueling, had a slight fever, and an ulcerated tongue. The vet tested him for FHIV, Feline Leukemia, Kidney failure, poisoning, and diabetes. All test were normal. He gave him a shot to make him want to eat and some special food. We thought he was doing well, because he was eating his regular food, drinking, his fever was gone, he was playing some, not falling over and all of his "plumbing" seemed to be working right. It has been 4 days. So, we let him go back outside today. (He is a barn cat.) He just came to the door, laid down in a strange place, and was drueling again. SO... What in the world is going on here?! Anybody have any clues? I am going to take him back to the vet when dh gets home with the car, but I am wondering if any of you have any experience or knowlege that would shed some light on this... something to suggest that the vet look for? Thanks, Cindyc.