Today I tried the product hartz flea and tick for cats and kittens. I put it on my furr baby one time. Within 5 minutes he was crying, hissing, spitting and avoiding me and his puppy brother. I rushed him to tub and gave him a good bath. He felt better but I have not seen him so upset. He looked scared. All i can say is do not use this product! It will hurt you animals. It’s a shame stores still have it on the shelf.