I have used the Feline Pine Litter before, and it seemed to work okay for my ferrets. The reason I stopped using it was that it was bothering my allergies. I love the scent of pine, but it will give me a sinus headache in no time flat. I figured if it bothered me that much, it could possibly bother the fuzzbutts too, not that they ever really showed any signs of a problem though. I had to stop using it due to my own allergies. Holly Tigger & Pooh [Posted in FML issue 3578]