Thank you for your responses.
What I can't understand is how feeding three dogs with a total weight of under 16 bs. can be so difficult! It sounds very interesting, but I AM sold on the Innova EVO. I am going to have to find a "low cal" food for Chizzie, she is a real porker -- even though she is the most active of the three and I control her food intake, she is packing on the ounces......