I bought Royal Canin Gastrointestinal Dry on the advice of my veterinarian after my cat, Mitts, was severely constipated. He’s had four enemas, is still on medication, and he’s doing great! In fact, he’s back to being his adorably annoying little self. He’s had no problems with constipation since, and has actually gained weight after dropping 10 lb. I highly recommend this food for other cats with chronic constipation.