3 years ago I found a kitten in my backyard who was feral. I befriended the kitten who spent the first 8 months of his life outdoors. I would have brought him in sooner but it took a while for him to trust me. While outdoors he appeared healthy until one day the sides of his stomach just balooned out suddenly. I thought he just ate a mouse or a bird and that was the reason why, but since then, his sides remained puffed out, and at times the sides of his stomach puffs out more and then decreases, but his sides never return to that of a slender cat. He walks around with his sides looking as if there is a grapefruit on both his right and left sides of his abdomen. I've taken him to his vet and to a specialist in Gastrointestinal disorders at 'The Animal Medical Center' in New York City. The specialist did a sonogram and a physcial examination showing nothing. He just said that my cat was fat. Another problem that was not addressed was the fact that my cat's stool is very, very foul smelling, every since I've known him. His sides looks like that of a very pregnant female cat. He has been dewormed by my regular vet and has been tested for feline aids/leukemia and his vaccinations are all up to date. I know that there must be something wrong with him because his sides remain swollen on a daily basis and his stool is extremely foul. Please let me know what you think his problem might be. Please note again that this happened overnight. One day he was slender, outdoors chasing squirrels up the tree and then my mother calls me to the backyard door to tell me that something is worng with the cat since his sides are all swollen out and the fact that his stool has such a very offensive odor must be a clue. I could appreciate any help concerning this situation, as it appears to be a mystery. I was wondering if another type of worm might be causing this problem. Everyone looks at roundworms and tapeworms, but he has been tested for these, and furthermore my cat has no fleas whatsoever. I own 6 cats and they are all indoors and not one of them has fleas. I change their litter box daily and sometimes twice a day because of this one cat because of the very offensive odor of his stool. I just want to Thank You in advance for your kind attention to this problem. Yours sincerely, Leona (Cat's name is 'Marby')