Ah. I feed mine two smaller meals a day as opposed to one bigger one. It is better for their digestive system as well. Still, my current dog only poos twice or maybe three times a day but she can often empty part of her bowels in one place and then do another a short time later somewhere else.
Her mother didn't do this and only relieved her bowels twice a day to coincide with her meals. They are all different, I suppose.

Some people have to poo twice a day, others once a day and some every other day, all of which is normal but just variation.
If the amount of poo your dog produced concerns you, maybe get him checked by a vet to be sure there isn't any minor health issue causing it. I doubt it would be something overly serious being as it is a lifelong problem.
Also, when she was younger, my current dog couldn't even eat a bit of chicken without getting severe diarrhea. She couldn't have meat at all. She is able to have some now but it just goes to show that even chicken and rice can cause problems in dogs. Everyone sees chicken and rice to be the diet that cannot cause any digestive upsets...ever!!!!
Also, if it is a complete meal, there could be some other ingredient added that might be disagreeing with him.