Purina Cat Chow:  Indoor Formula is a great cat food product.  My cats chow it down when they get it.  It prevents my cats from getting many hair balls.  It provides nutrients, a well balanced diet, and is fairly inexpensive.  I have a large number of cats so I do not break the bank when purchasing this item .  It is not hard to find this product at the grocery store, pet store, and department store.  It comes in a size that is good for me.  It provides many of the nutrients for all cats, from kittens to adult cats, and it gives them a taste of the outside as they love to eat grass.The...