My previous dog had what I called a "tender stomach". If she didn't get fed twice a day with a bedtime snack, I had the gurgling problem and she would vomit nasty, yellow bile and be miserable. So with my houndie, since I'm already pre-trained with the two meals and the snack, I'm just carrying on the practice and no problems so far. My personal theory is... humans wouldn't like only one meal a day, either... You'd be starving by bedtime and would probably wake up in the middle of the night with hunger cramps. So... two meals a day and a bedtime snack is what we do.