My dog had a very sensitive stomach. I could -only- give him his one dog food, no weird treats, no people food, nothing out of the ordinary. But as dogs do, he would always find something, and especially on walks would find something old or bad and eat it. Almost once a month he would then have a giant explosive diarrhea episode starting at 3am and lasting a day and a half. It was absolutely terrible and would take days out of our life where we'd have to stay home and make him go outside every hour (it was either too cold or too hot to just leave him out and he would just cry if left out all day), plus of course he'd be upset being sick. We started giving him one of these with his breakfast each day and haven't had the problem since!!! It's an extra thing to buy every few months, but I will do anything not to go back to the days of absolutely terrible explosive diarrhea. I either give it to him like a treat in the morning or just plop it in his food bowl with breakfast. It's been a life changer. One time I tried a different brand that was maybe slightly cheaper and almost immediately noticed him having stomach problems again, so I will stick with this brand!