I have some goats I know definitely need it since they're starting to get the fish tail and really furry back legs (furry pants as I like to call them), but there are two does in particular I'm questioning. Their coats aren't too bad, but they are starting to get a tiny bit of brown in their black fur. No fish tail present. I'm just so scared of overdosing them. I didn't even know copper deficiency was a thing until recently Then I realized how much some of my goats fit the description.