You may notice on the ingredient list that there one or two forms of calcium within the diet: either calcium mixed with phosphorus (called dicalcium phosphate) or a calcium source alone (called calcium carbonate). Different diets require different amounts of calcium and upon what type of other ingredients are in the diet. Other diets may use bone meal as a source of that calcium and phosphorus, but bone meal contains other essential nutrients but could also contain heavy metals and other potential contaminants.
For this reason, Nom Nom has taken the approach of using these exclusive calcium or calcium phosphorus sources to best balance the diet to really promote normal health and provide only those nutrients without unintended consequences from the addition of bone meal. Calcium is especially valuable for puppies. You do not want too much calcium, but of you cannot have too little calcium.
For all of the diets labeled for puppies (meaning for growth and the calcium is carefully titrated to be safe for both small breed dogs as well as for large breed dogs and in order to try to prevent things like developmental orthopedic disease according to the best information we have available from the current science.
