Just wanted to post this in case it would help someone else. After 8 weeks of diarrhea/runny stools and $800 of tests, meds and two puzzled vets, our Golden suddenly got better. We attributed it to a couple things. We live in Arizona, and Chester is 13 months old. Even though we kept him inside in the air-conditioning as much as possible, the heat really seemed to make a significant difference in his stools. Our first cool day and he firmed up almost completely! Also, we tried many high-end dog foods, especially the highly rated "No Grain" varieties. We discovered these also made him runny. They just seem to have too high of protein content and aggravate his digestive system. This was confirmed after he got into our daughter's dog's food, which is a No Grain food and boom - runny again immediately. After reading posts on this Forum, we tried Fromm's Gold Holistic Large Breed. He has absolutely done GREAT on it! So, watch out for the heat and No Grain foods! Here's to your Happy GR!