7 cups of food is a lot, I use both foods you mention and and Earthborne Holistic, my dogs aren't eating much because of the heat. It's been hit & miss with them.
My big male, 120lbs only eats about 3 cups of kibble a day.
Lakota - WGSD 1/13/10
Wolfen - WGSD 12/31/14
Bull -WGSD 2-10-10
Apache - Shiloh Shepherd 12/15/02 - 6/9/15
Kiya - Shiloh Shepherd 5/15/04 -12/19/25