Wheat, Channa, Barley and Ragi? These are healthy for humans, not for Dogs. When there is too much of these cereals in the food, the stool is supposed to be more and soft. Labs are prone to be lazy when they are only on veg diet. Dog's body temp is usually higher than human body. So u need to check if it is beyond 103 C. Try to add some curd to the diet. If u r non veg, then feed him meat. He is a growing fellow and needs more meat based protein.