You didn't mention breed, size or activity level of your dogs. If you are going thru 50 lbs a week of anything, they must be very large dogs. Purina pro plan preformance if they are active working dogs (actually mine are all on it from weaning thru death, and I have a 14 year old that can still hunt). Even if the aren't active dogs, you just feed less of it. During the summer my dogs that aren't in training (German Shorthairs) 50 thru 70 lbs eat 3 to 4 cups a day. Of course working dogs get more. No gas, stools are small, well formed, almost no smell (as no smell as you can get!).