The horse we just perchased for my fiance has rubbed the top of his tail to nothing,it was so when we bought him. The previous owners girlfriend said she wormed him about a month ago. I don't know what she used but Im planning to give him a zimectrin gold.Im thinking maybe pinworms? A friend said to use listerine on his tail to stop the itching for him,anyone heard of doing this? I was thinking raw skin + listerine = ouch?