A good question, but not one I can answer generally. BalanceIt offers many recipes for a canine diet. Check out their website. wwww.balanceit.com

The BalanceIt recipes I use have nearly no copper, and neither does the BalanceIt supplement I add to those recipes.

Humans generally consume .3 to 1.3 mg of copper in day in their diets, which is sufficient that copper deficiency is not a problem in our country. We just don't need a lot of copper to flourish. No evidence that dogs need more than we do.

So I researched copper deficiency in humans, and it is uncommon. If babies are fed only a cow's milk diet with no supplementation of copper, they can develop a copper deficiency. Oversupplementation with zinc can cause a copper deficiency because zinc can neutralize copper in the diet.