Recently one of my cats, I don't know which one, since we have 2 has been throwing up hairballs. This is the second time in a month this has happened and I'm worried. I read in one of the threads that I could buy something to put on their paws and they will lick it off? Does anyone know what I am talking about? Also, we are in the process of switching them over to adult food, so I don't know if this caused them to have an upset stomach. Should I buy the stuff to put on their paws, or should I start buying hairball remedy food?