If we fed the suggested amount on the bag, our dogs would more than likely be way over weight. The only way to feed is by watching our dogs weight like a hawk would watch a lone chicken. Are your dogs over weight, under weight, or just right now? Feed the same amount as you were feeding of their old food if they are just right in weight. A little less if they are over weight and a little more if they are under weight. WATCH, if they gain, loose or stay the same, make adjustments in the amount you feed. I feed 13 dogs and am always adjusting someones amount. The time of year makes a difference for some dogs. Some dogs are more active in the warmer months therefore needing more calories. Winter usually is a less active time of year and dogs don't need as many calories unless they are housed outside and then they may need even more calories. FAT dogs are unhealthy dogs. Manufacturers like you to buy their food and the faster your dog eats up a bag the sooner you have to buy another. If you are not sure what your dog should weight, ask your vet and go from there. Hope this helps.