I guess it isn't because they're on him and they are itchy. i picked up that DE stuff and i have a citrus extract juice cooling off from making it. I am going to put the citrus extract on him and rub it in to kill the fleas. i am going to be using the DE on the carpet/bedding ect. i know to wear a mask and im going to keep him out of the room for a while after i use it so he doesn't inhail the dust cloud.