I have used that shampoo a couple of times in the past. I used to live in VA. and every time we went outside to the grass, Dora will bring back a Tick on her leg and Zodiac was one of the huuundred shampoos I got for her. Her vet did not recommend the use of it, because of the ingredients potentially harming her nervous system, something like that. Since then I have used it only one time 2 days ago. We move to TX and in 1 year she only had 1 Flea.