Originally Posted by caseymyhorserocks
Well, for the tail itching, she could have pinworms because they lay their eggs under the horses dock and it makes them really itchy.. Worm her with a pyrantel worming paste such as Panacur or Strongid P. Even if you have done fecal egg tests, pinworms and bots often don't show up in them even if the horse is infected, so, a horse should be wormed against both of those at least once year.
couldn't agree more. Any time I've bought or adopted a horse with a scratched out tail I've wormed with something that gets pin worms and the problem has been solved. I think that is usually the underlying cause. Maybe she is more aware of her nether-regions when she is in heat and scratches more then but I 'll almost guarantee you that she probably has pin worms.
As far as getting a light colored horse white you need to buy a whitening shampoo. They are special shampoos formulated with something that looks dark blue in the bottle. It will make your guy blindingly white. It has something for brightening the white, I don't know how it works but it really does. It works WAY better than regular shampoo which wont get out whatever is staining the coat yellow.....