The decisive solution for my cats
My Siberian has showed small traces of blood in her stool for a few months (they are formed but soft). The cat has always eaten Royal Canin products as well as Happy Cat, and the vet has diagnosed a strong intestinal inflammation due to a likely food intolerance to certain ingredients in the food. I was recommended a diet based on RC Sensitivity Control and the cat is now very well, her fur is even more thick and shiny, the blood is gone, and the stool consistency is back to normal. I would only recommend it if your vet has advised it, as it is a 'veterinary diet' and shouldn't be tried without a vet's supervision.