My Ryver is 6 months old. She eats Solid Gold Wolf Cub Large Breed puppy food (2 cups 2 x's a day). We have had Ryver for 3 months now, and this is her second brand of puppy food. We had her on another premium brand of large breed puppy food and her stools were soft, kind of like cow pies. Changing to Solid Gold has not helped. Does anyone have any suggestions? At what age should I be switching to adult food? Has anyone tried probiotics?