At the risk of setting off World War III (just when a truce has been reached in the mayo versus Miracle Whip controversy), although I wish I could leave dry cat food out for my two boys to eat whenever, I don't feel it's in their best interests health-wise. They are strictly indoor cats so don't have access to any other food. There's a woman who has a program called, "Cat Chat," and her reasoning persuaded me to switch from dry food to wet (canned) food -- said that unlike dogs who are omnivores, cats are "obligate carnivores" and feeding them dry food containing carbs, etc., is bad for the pet. So, I am trying to avoid medical problems for my cats, as well as needing to avoid vet bills, but canned food is certainly less convenient as well as more expensive.