My 13 year old Kitty has been eating wet food and also the Royal Canin high-fiber response dry food because of diarrhea issues he was having last year. The downside is he gets in a hunched position for an hour or more before a BM. I believe he is experiencing either cramping or discomfort with this fiber content. Has anyone experienced this? I tried to substitute another RC brand but the diarrhea started to return. It works but I hate to see him in discomfort. He won't touch pumpkin so that is not an option. Thank you.