Pumpkin has lots of fiber, which is good for the intestines. It can help with constipation, or diarrhea, and it's good for humans too. Remember, not to use the pie filling, but pure pumpkin. Some vets recommend a little every day. Here's the diet forum,
http://www.yorkietalk.com/forums/yorkie-health-diet/, but people talk about it a lot on the sick forum, because its great for diarrhea and constipation.