For those who does home cooking for your dogs, what type of calcium supplement do you use for them? I home cook, would like to do raw and tried but it just didn't work with my dogs. I home cook because Kassie has many issues with food with allergies, and colitis. So her diet is restricted. They no longer are on any types of commercial foods. I've been using oyster shell calcium, I know some use egg shells, but I never know the right amount to give them. With the oyster shells, I can tell the amount I'm giving. But I'm wondering if it's an ok supplement for them. Any thoughts? Plus I'm trying to balance it out with the right vitamins. I know that the natural way is best, but I do add some forms of supplements, like vitamin C, E, and fish oil. Others vitamins given naturally are from pumpkin and cooked spinach added to ground burger, all wheat rice and boiled eggs.