That's what I was wondering. I know dandruff is caused by dry skin and can be washed out, but is it ultimately caused by a mineral deficiency? Regardless, goats should have free choice minerals.
I had a goat mineral salt lick thing but ran out last week and I hadn't gone shipping. Picked up 50lbs of goat minerals today and got some out for them. I'll give them a bath and see what happens I guess.