[sganow]

I would try sticking with the grain free foods and see what happens. He may have a reaction to some of the grains or other ingredients in the grain inclusive formulas. Plus, the grain free foods are generally higher in protein and lower in carbs. He might feel more satisfied on the grain free foods.

And for what it's worth, my dogs seem to eat more of the Fromm grain inclusive foods than they do the Horizon Legacy. An 8.8 lb bag of Horizon Legacy lasts us about 9 days, and a 15 lb bag of Fromm grain inclusive lasts us about 12-13 days. I free feed so they are eating as much as they want.