Hi Linda,
You can find information to guide you in the USDA nutrient database. For example, while they don’t list freeze dried liver, there is an entry for raw liver. The Ca is reported as 5 mg/135 kcals which is 37 mg/1000kcals. For growth the safe upper limit as reported by NRC for Ca is 4500mg/1000kcals. In comparison then you can see that liver isn’t a high calcium food. However you may want to limit how much liver you use for other reasons.
For cheese… mozzarella they report 505 mg for 300 kcals= 1683mg/1000kcals So from a calcium standpoint cheese is fine to use as well.
It is recommended not to exceed ~10% of the total daily caloric amount from unbalanced sources. I have used a different complete and balanced food with an appropriate Ca amount as treats for training and I have placed kibble into a plastic zip lock and let it stay overnight in the fridge with a few slices of hot dog in the bag… kibble with a kick of flavor.
Good luck with your pup!
