Excess Calcium contributes to skeletal disorders, NOT protein.
First, read this article recently published by Dr. Mike: /best-dog-foods/best-large-breed-puppy-food/
Take a look at this thread and read at least the first several pages (taking particular note of information and links posted by Hound Dog Mom) for lots of additional information: /forums/topic/large-and-giant-breed-puppy-nutrition/
Here’s a list of foods (which appears on page 36 of the above thread) that have appropriate Calcium levels for large and giant breed puppies: https://docs.google.com/a/dogfoodadvisor.com/file/d/0BwApI_dhlbnFTXhUdi1KazFzSUk/edit?pli=1
