dandruff

Hello! I have 2 oberhasli wethers. They are about 3 and never have had any health problems before. Over the last month and they got really a lot of dandruff and now they have bald patches on their noses back legs and rumps and their fur just seems dull. They got safeguard dewormer about 2 weeks...

I have 4 Nigerian dwarf goats all 1 year old. Over the last couple months two have had really dry skin and dandruff. I have well water so I thought maybe it was a copper deficiency. One goat lost weight but once I gave him a copper bolus, he went back to normal weight but his skin is still...