Product review (5 stars): Oh No! Hairball - A God Send
Oh No! Hairball really works with my 3 cats, especially with Mollie, the 12 year old.  Her stool was small and hard but with Oh No! Hairball, they are softer and plump.  It's also lessened the number of hairballs with all 3.  The product appears to have disappeared from store shelves which was distressing until I found it on Amazon.com.  Roo, Mouse, and Mollie give it a thumbs up!