Originally Posted by llmercll
I know he needs calcium though, so we give him cheese occasionally as a snack or a side to his meal.
One big problem sticks out above all others.
You have a big problem with calcium, and an even larger one with Vitamin D deficiency. Cheese can be a great source of calcium, but it should not be fed in place of actual calcium supplementation. Vitamin D deficiency in itself will cause loose stools or diarrhea, and it can also affect the prostate, which, if enlarged, will also cause digestive issues.
A calcium/Vitamin D supplement is necessary, and you might also want to consider replacing some of the chicken with beef liver or eggs for a more nutrient dense meal.
Some home-cooked diets are too high in grain content, but it seems this one might need to have protein reduced and complex carbs added. Personally, I use sweet potato and rice in their staple meal to keep the protein at moderate levels. You can add other grains like barley or oats, as well.
But honestly, if there is a deficiency already present, consider supplementing, at least until you can get his new improved diet plan worked out, with dry food.