How does one know the Calcium level in commercial dry dog foods. I actually have three different kinds right know for different dogs and not one lists the calcium level on the bag? Thanks!

You can search around this site or on the internet (calcium has been a frequent topic here!) but in some cases you will need to call the manufacturer. They should be happy to share that information over the phone.

If it's not on the bag (with the guaranteed nutritional analysis) or on their website you'll have to call the manufacturer.