"My best friend, Rudy, happens to be my cat who I adopted from a shelter 3 years ago. He just turned 7. Even though he is brushed and groomed on a regular basis, he was still having hairballs on too regular a basis to suit me, and the offwhite carpet in my house! And I'm sure he doesn't like it either. I had tried him on several different brands of food, but none seemed to affect the occurence of hairballs. About 3 months ago, I started him on Science Diet Hairball Senior dry food and also he gets a small can of the SD Hairball Senior wet food about once a week as a treat. In the past, any changes in his diet would cause upset stomach for several days until his system got used to it. And any kind of wet food caused problems. Well, he has only had one hairball and no stomach upset on the Science Diet food. He loves both kinds of his new food and I love not having to clean up hairballs! I wish I had changed to this long ago; but now I know and won't change. At least as long as he will eat it, and that doesn't appear to be a problem at all. Thanks so much, Rudy and his Mama"