My cat was the same way with loose stool all the time. Iwas changing her liter box constantly. The vet I was taking her to could not figure out what it was. I decided to change vets and the new vet told memy cat had Irritable Bowl syndrome. SHe was on Prednisone for about a month and the vet told me to feed her Eukanuba veterniary diets Low-Residue Adult cat food. It is a dry crunchy food and it worked perfectly!!! That is all we give her. Once in a while we give her a treat but not too often cos she gets sick. SHe is doign great now. Hope this helps!!!
Back at the beginning of 2007, Ferris, my DLH former feral, was having serious loose-stool issues, and the vet also recommended low-residue dry. That had zero effect on fixing the problem.
However, the Bene-Bac worked, and worked SO well, that this is when I began looking into dry foods that contain probiotics, and wound up choosing Nature's Variety Raw Instinct.
Later on, as it turns out, the loose stool issues that Ferris was suffering from can almost certainly be pinned upon the contaminated food that I had been unknowingly feeding him. However, he's done so well on the Raw Instinct that I continue to feed it to him, and my Bengal, Penny, adopted in May of 2007, took to it quite well.
I strongly recommend to folks that they try probiotics for loose stool issues - it really made a huge difference for my boy.