Tuck has had soft stool about half the time since he was a puppy. I have tried pro/pre biotics, Ive changed his food a dozen times, I have tried pumpkin and the only time his stool was good most of the time was when I fed him Acana. Unfortunately I cannot afford it so he is on Earthborn Holistic Grainfree Lamb. My question is I know overfeeding can also cause soft stools but I am afraid of underfeeding him. He gets 1.5 cups in the morning, 1 cup for dinner, and then 1/2 cup right before bed because he has acid reflux if he doesn't eat right before bed. So all together he gets 3 cups a day and I feel like any less would not be enough food for him. He is 11 months and 60lbs. On the bag is says 3-3.5 cups a day. Any input would be greatly appreciated. Also he has been tested 2x for parasites which was negative, and he is on monthly heartgard. TIA!