Interesting!! When we first had DC, we had him on Iams. When we came home to diarrhea up the walls and all over him in his kennel we rushed him to the ER. Multiple test and IV's later, we fed him chicken and rice and had him on 5 different things the vet gave us. i finally got tired of cooking so much for him, we searched food brands and went to Nutro. Immediately he was fine. We started him on the puppy food - small bites, i think its lamb/rice/oatmeal… or chicken/rice/oatmeal... as he was under a year old at the time. he had been fine, and so we got the adult formula after he was a year old, then decided to get a female. She was 16 weeks when we brought her home and we couldn't separate them for feeding so we put DC back on puppy food with adult treats. he gained some and was very active, but lately he started dropping the weight fast and very noticeable. we have been mixing the puppy and adult food to get lexi ready for adult food and then started with the wet nutro to fatten DC up. Lexi was always stockier than DC, but he shouldn't have his hips and ribs showing... As far as his poops, they vary. After waiting all day, they tend to be more soft, but the evening and mornings are normal and same as Lexi's.