My dog Duke is a 7 y.o. Great Dane mix whom I have always free-fed. He regulates himself and only eats when he is hungry. I know...I suppose this isn't the ideal option, but it works for him. He gets regular walks, is very healthy and active, goes to daycare 1x/week and is a perfect weight.
He is currently alternating between California Natural Lamb/Rice and the Sweet Potato/Herring dry kibble.
Problem is this: I recently combined households and we now live with another dog, Coco, who is a purebred Chocolate Lab. Coco WAY overeats and I can see that free-feeding him is not an option.
I really want to try placing Duke and Coco on one of the grain-free foods like EVO or Orijens...but at the rate Coco is eating, he will literally eat me out of house and home!

He is not officially overweight...yet...but any more pounds added and he will soon qualify as chubby.
Does anyone have experience turning a "free eater" into a "2x per day eater"? Also, if I put them both on a "weight maintenance" diet, will Duke still be getting all of the fats and nutrition he needs?
Thanks much!