Copper plays an essential role in plants and animals. It helps in the formation of red blood cells, also is an important protein to make up bone and tissue. It can help during the healing process.
Copper is found in liver, fish, whole grains, and legumes. Most quality commercial dog foods are supplemented with copper to assure adequate intake.
Copper is necessary for a number of body processes including the formation of collagen, bone and connective tissue, the absorption of iron, the development and maturation of red blood cells, the function as an antioxidant, and the development of pigment in hair.
Dietary sources of copper
Copper can be found in these Dog Vitamins that I highly recommend. I have a full list of the dog vitamin ingredients on the site