sorry about coming back to this thread so late, but i had to run earlier so i wouldn't be late for obedience class.
"too much calcium" is really only a problem if you feed too much calcium-containing foods or excessively high amounts of bone with only little meat. for dogs a calcium/phosphorus ratio of between 1:1 to 2:1 is appropriate, with the lower end being better. that means that you want your diet to contain between 1 to 2 mg of calcium for every mg of phosphorus.
additionally, NRC nutrient guidelines call for 50mg of calcium and phosphorus per kg of body weight per day in an adult dog's diet, that would be 22.73mg per pound of body weight.
for my 30 pound dog that would be 682mg per day, with a minimum of 682mg calcium for a 1:1 ratio and a maximum of 1364mg for a 2:1 ratio.
here are a few examples of common cooked foods and their average calcium and phosphorus content per 100g:
skinless chicken breast, cooked: ca 13mg, ph 165mg
ground beef 70% lean, cooked: ca 37mg, ph 194mg
chicken liver, cooked: ca 11mg, ph 405 mg
cheddar cheese, generic: ca 721mg, ph 512mg
whole egg without shell, large, scrambled: ca 43mg, ph 104mg
oatmeal, cooked with water only: ca 52mg, ph 474mg
carrots, cooked, no salt added: ca 30mg, ph 30mg
green beans, cooked, no salt added: ca 44mg, ph 29mg
sweet potato, baked: ca 38mg, ph 54mg
white rice, long grain, cooked: ca 10mg, ph 43mg
brown rice, long grain, cooked: ca 10mg, ph 83mg
white potato with skin, baked: ca 15mg, ph 70mg
www.nutritiondata.com is an excellent tool to calculate average nutrient contents of foods and you can even combine different ingredients to analyze recipes. just make sure you pick raw ingredients if you calculate a raw recipe, and cooked ingredients if you are calculating a cooked recipe.
if you need a calcium supplement to balance out recipes, egg shell powder is an excellent, inexpensive way to go. just save your egg shells whenever you use eggs for cooking. wash them immediately and pull the thin membrane skin out. once you have collected a decent amount of shells, dry them in the oven at 300 degrees for 10 minutes to make them more brittle. then grind them to a fine powder in a coffee grinder or food processor. i mostly use a mortar and pestle these days, less mess and cleanup that way, but it takes a little longer. your egg shell powder supplement will be of especially good quality if you use organic free range eggs. one teaspoon contains about 1800mg of calcium.
if you don't use many eggs or are too lazy for this and would rather spend money than time.,
this product is very nice. i prefer it to other calcium supplements like for example bone meal since it's from sources that are less exposed to pollution. bone meal also adds a fairly high amount of phosphorus, so you have to use more of it per pound of meat to achieve a proper balance.