We bought and used Hartz 3 in 1 Dog Spray for our Jack Russel Terrier; he only had a flea or two, but we wanted to make sure to get rid of them. So after we bathed him in a doggie oatmeal shampoo, we sprayed him down with Hartz 3 in 1 Dog Spray. It immediately turned his hair yellow and has caused a terrible itchy/burning rash. My poor baby. It sure makes you feel bad to watch your baby go through so much discomfort because of something you sprayed on him. We know for a fact it was that particular product that caused it as we saw his hair turn yellow as soon as we sprayed it on him. He is normally white in color. I don’t know if he ever will be again.