I just switched Rasha and Cheetah over from an Orijen & Taste of the Wild mix to a Serengetti & Taste of the Wild mix. (I do this to help save money) My cats do very well with variety and I have never had a problem. Yesterday I noticed that Rasha had blood in his stool, and I am wondering if it had something to do with the food switch? I read so many wonderful things about timberwolf that I wanted to add it to their rotation. Is there any other reason why he could be bleeding? And what exactly does it mean?