Our 5-year-old Black shorthaired dachshund has Alopecia. or so we think, we took him to a specialist and they gave us medication to help prevent and treat his skin and it worked for a couple of months but then when we ran out of his medication and couldn't get a new prescription for a couple of days it popped back up and hasn't gone back to normal since. We don't know how to help his hair grow back, that's the only problem we are having now. Any ideas? we put coconut oil on his skin to help keep it hydrated, we also heard that melatonin could help with hair loss, any ideas??