My cats had fleas and to help prevent them I thought buying their spray would work. It was suppose to treat and kill all the eggs. After all my treatment was done I used it on my animals and both of my cats started seizing and foaming out the mouth. As well as throwing up everywhere. Within the 20 mins. After that it was so hard for their hair to grow back in and they scratched themselves raw with a chemical burn. I didn’t know how to help my babies until the next morning at the vets when they told me hartz kills animals even when they sell it on the shelves everywhere. Don’t buy it cause it’s cheap. Read reviews first cause I felt like a horrible animal mom after my cats had to go through that. They had burns inside their mouths as well for trying to lick off the spray.