Some of our goat are starting to get fish tails. They have free choice minerals already and there coats look really good and alot have shiny coats. Could i hit them with some multimen? They all had a dose 3 - 4 months ago. Could i give them 1/2 a dose instead since its only been a few months? Or should i just order some copper bolus? If i should get some were do you guys get yours?