We adopted a Bullie a few days ago. He's on Kibble and Bits. The dog looks really good, firm stools, good muscle tone, overall really good dog. My other dog is on Blue Wilderness so I mixed Blue with the Kibble the first day we got her. Her poop went runny this morning. So, now, I'm starting to wonder if I should leave well enough alone. She's been on Kibble for 3 years.