Recently, one of my mackerel tabby cats, Casey, hoicked up a massive hairball. He'd earlier brought his entire breakfast back up - on the carpet - no doubt, to make room for the hairball's exit. It was so large, I actually thought it was an entire dead rat or extremely large mouse and was relieved, on closer inspection - from a safe distance, you understand - that it didn't contain legs, or ears or tails. It was the biggest hairball I've ever seen. I had to take him to the vet because he went off his food. The vet suggested Katalax and since I received it from you, I give a little bit to both my cats - Casey AND Gibbs - and fortunately, they love the taste. Hopefully, there'll be no more ack-ack-acking sounds and gigantic hairballs being dumped on the carpet!