My 3 yr old filly is shedding out her winter coat unevenly... she has she out nicely on her neck, chest, and legs. She has shed out some of the hair on her back, hind end, and belly but the hair is still longer than the hair where she has completely shed out. Is his normal? Does she have worms? I gave her an equimax wormer on june 16. Any ideas? Suggestions on how to help her coat?