As I’ve been reading more about supplements—just like with people—there seems to be a lot of debate around the value and necessity of supplements. The one I’ve most often been told needs to be supplemented is calcium. Reading some of my books on the topic, I came across this quote by Wendell Belfield, D.V.M: It’s too much, not too little that bothers me most in regard to calcium.
Hypercalcemia can cause increased thirst and urination, lack of appetite, vomiting, constipation, lethargy, and other symptoms. There is a blood test to check blood calcium levels, if you’re concerned.
Definitely, our pets need calcium. According to the National Research Council (NRC), dogs need about 50 mg per kilogram of body weight daily, that puts my 30-pound Shelties at needing 650 mg daily. Another guideline cited about half that amount, or less, depending on the author’s definition of size:
- Toy dogs, 100 mg.
- Small dogs, 200 mg.
- Medium dogs, 300 mg.
- Large dogs, 500 mg.
Not that it’s anything new, but that’s a big difference in requirements. Intuition tells me our bodies must be a little adaptable because normal eating isn’t that balanced. But I’m not a scientist. I just do the best I can.
I do supplement, using what I consider a natural source of calcium—eggshells, finely ground into a powder. One whole medium-sized eggshell makes about one teaspoon of powder and has about 800 mgs of calcium. I give them ¼ teaspoon of ground eggshell daily
Some sources say that human bodies are more forgiving of imbalances in natural sources of nutrition, and I hope that’s true of dogs and cats too.
 Martin, Ann. Food Pets Die For. New Sage Press. 2008. p. 140.