I have an inside cat who throws up all the time!  I used to buy the most expensive food I could find that was sold to me as something she wouldn't toss up...it was supposed to be all natural, no grains, that sort of thing.  She would throw this expensive food up constantly.  I was very pleased when I switched to the Purina Cat Chow Indoor Formula cat food.  My cat seems to really like the taste and she throws up much less often.  Whatever the ingredients are in this cat food, they are very beneficial.  I now also feed it to my ourside cats.  The hairball problem in all four of my cats has...