My horse has been having an issue recently with flaky skin. She has gray (she's bay) skin flaking off predominantly on her neck, mostly towards her throat. She had it a while back and a passing vet commented that it looked like contact dermatitis. It went away after I tried a bunch of different medicated shampoos. It recently came back after I trace clipped her. I am almost positive that it's a reaction to a Rio Vista shampoo that's supposed to make the horses a more burgandy bay. Can anyone recommend anything to clear up this problem? She's had it twice; the second time confirmed the Rio Vista shampoo was the "perp". Thanks!