Over the years I have a collection of medicated shampoo....non never really worked and if they did give some releif it only lasted less then 24 hours. Allie and Missy more so Allie is sensitive to shampoo and Tropiclean has been the least irrtating of all the shampoo so far. Allie still scratches after she has a bath she attacks the chair wrung and you hear this moaning sound coming from her as she rubs and rubs and rubs.......I bought a bottle of PEACE AND KINDNESS SHAMPOO a natural alternative to medicated shampoo....it is sulfate free..hypo-allergenic...perfume free and dye free. Allie and