When you change a dogs food you need to do it slowly, mixing it in part with the old food and new food. If you switch it right away it can cause digestive problems. You may also want to look into getting better quality food, in the diet forum there is info on different types of food.
One thing that can cause the feces to be hard is if the dog is not getting enough water, are you making sure that your puppy drinks water throughout the day?
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