Bountyhunter, Mainstay is cornmeal based, & this other one is wheat-based. Being grains, they are probably considered roughage/fiber. Both are the main ingredients in cheap dog foods, and the backyard is usually ample proof that it keeps them going.

But conditions away from home can cause gastric problems of all kinds, just because the conditions are different, not necessarily bad. Some people seem to have more delicate GI tracts than others, that's all.

For instance, if I don't get a suitable amount of chocolate, fat & sugar on a regular basis, my digestive system suffers and my mental condition deteriorates! <img src="/images/graemlins/laugh.gif" alt="" />

Sue