When the dog is fed at the same times each day, there is a rush of gastric juice in anticipation of the meal.
What I was told to do is vary the feeding time, so that we don't have this massive gastric juice influx happening.
This truly works.
I also realized that the calculated amount of 1 1/2 pounds wasn't enough for him, and after I bumped it up to 2 pounds of raw, we had no more problems.
How old is the dog?