My 16 year old cat has been in and out of the vet for the last year. Symptoms are:runny poop but small amounts, straining, gas when trying to "go", is now losing weight, a pound and a half in 2 months. He has good appetite, actually wants to eat all the time. They put him on prednisone this time around, seems a bit brighter as far as general wellbeing but zero difference in poop. Tried the veterinary food, science diet, wouldn't eat it. I know this sounds odd, but all of this started when I started feeding a strictly grain free diet. Could very well be coincidence, but I wanted to give all info possible. Blood work was normal, thyroid too, other than slightly elevated creatinine and BUN. Liver enzymes were ok. Tries pumpkin, sort of helped, but not much. Won't take metronidazole, fought with him for days and it isn't worth the stress for him. I feel, in my gut, its intestinal cancer or a tumor of some type. IBD is how we are treating it. He still seems to be in pain 50 percent of the time, although the prednisone has eased that some. Any suggestions, advice, anyone have a fur baby with similar symptoms? I just want him to feel better and not be in pain.