When we move our dog had fleas we used the pill for the fleas and two weeks had no results. So we tried the shampoo, that was a huge mistake. After using it our dog went blind for the night, by morning he was very sick, and he began to lose hair plus he was inching nonstop. I call Hertz they said he was allergic. My neighbor is a vet assistant and told us that wasn’t an allergic reaction. Since then our dog has lost so much hair and his skin is so dry he doesn’t get fleas. I never thought that when you use a flea shampoo that they meant he would lose hair and have skin issues to get rid of fleas. Never will I use a Hartz product!!! It’s been 6 months and he still can’t grow hair back and inches like crazy! This is a horrid product!