Mandy, our 11 year old rescue kitty, has been on the dry and canned [Royal Canin Veterinary Diet ® Feline Gastrointestinal Fiber Response dry cat food] for probably 4 years due to irritable bowel. She is so much more comfortable, no diarrhea, no gas, and she is cleaner than before the diet. It also helps with our other cats when they have dietary upset for whatever reason.