I have a yorkie and a pug. My pug was having high levels of PH in his urine and we thought it might be his dog food even though we always got the more expensive kinds. But because of his problems we started doing research and switched to Blue. It has copper but not the kind in most dog foods. It is Copper Amino Acid Complex. It is a holistic food. You might want to try it and see if it helps.
both my yorkie and pug love it and they both have great shiny coats and are healthy again!! They have a special blend for small breeds.