I hope someone can offer some advice... Black Bart has been with us about half a year. He was a stray and though we know he took care of himself (mice, garbage, whatever) for at least half a year, he was in amazingly good condition when he came to us. I started him out on whatever cat food was available nearby (Whiskas, etc) and he started having very bad diarrhea. At the vets they recommended that we put him for a short time on only cooked chicken and/or fish, then start him on Royal Canin "Sensitivity Control" (v. expensive!). We found that for the short time he was on just chicken and fish, he was actually not pooing enough and was a bit constipated - when he went on the special food it was straight back to diarrhea - loads of it, all the time. No different to being on Whiskas. So I went back to just chicken for a longer time and he was constipated again, but as time goes by his poos are getting softer and now he's having diarrhea again (he's still on just chicken), though far less of it than before. The strange thing is, he appears to be in very good condition - the perfect weight, shiny coat, clear eyes, great teeth... the only suspicious other things are that he acts like he's starving at all times and he pees WAY more than any cat I have ever known (thought he doesn't seem to actually drink a lot more than other cats). It has been suggested that stress has caused this, but it's been a while now since he moved in and he actually appears to be a pretty relaxed guy. I will go back to the vets, but they are very busy and sadly not that interested (I live in a rural place and there is not a lot of choice of vets). Thought I'd look here first to see if anybody can shed some light on this?