One of my girls has had loose stinky bowel movements for a while. She was eating Royal Canin Persian, but I tried her on Hills. I went to Pets at Home and picked up a bag of Pro Plan Delicate Kitten (she had Kittens at the mo) and shes sorted! I guess its just trial and error. She will be staying on this - no more stinking the whole house out in the middle of the night!