We recommend using the copper bowl only with water and not with pet food.
Although copper is an essential part of the diet of most pets, there are some situations in which ingesting copper or copper-infused water can affect your pet negatively. If your pet has been diagnosed with Copper Storage Disease, your pet should not drink from a copper bowl. There are some specific breeds that are biologically inclined to have issues with copper storage. These breeds include Bedlington Terriers, West Highland White Terriers, Doberman Pinschers, Skye Terriers and Labrador Retrievers. While it is possible for cats to develop Copper Storage Disease, these cases are considered to be rare.
If you are unsure whether a copper pet bowl is right for your pet, contact your veterinarian for advice. If your pet is not a cat or dog, also consult your veterinarian about whether a copper bowl is safe for your pet.