I recently bought a book about boxers by Sheila Webster Boneham. In the chapter about feeding a boxer puppy she states that "commerical puppy foods contain extra protein and calcium to promote faster bone growth". In the next few sentences she states that "puppies don't need the extra nutrients....[they] may suffer serious harm if fed too rich a diet...extra protein and calcium cause faster bone growth and the soft supportive tissues can't grow as fast as bone". She then goes on to state that if feeding a puppy food, to switch to adult food at 4 months. This seems way too young to me. Anyone ever hear of this?