Many commercial pet foods have a high copper content, causing ' copper toxicosis" in certain breeds of dogs.
For example - terrier breeds (Doberman - pinchers) mean terrier. these breeds cannot metabolize copper and they may acquire copper toxicosis.
This condition is related to excess copper accumulating in the liver. e.g cereal has a high copper count which is found in many dog foods e.g kibble as often used as binders.
Must stop all this artificial food and help restore and detox the liver.
e.g. homeopathic chelated copper drops, homeopathic Liver Detox 36 drops and Colostrum tablets (chewable) and feed a home-prepared diet.