My cat and dog were suffering from fleas, and they came into my home. I bought the Hartz UltraGuard Pro for my cat, and put it on her on a Monday afternoon. Tuesday she wouldn’t walk around, use her liter box, eat, drink….nothing! I called the Vet and they told me to take DAWN and wash it off of her immdiately and give it 36 hours to leave her system. She didn’t get better, I ended up feeding her through a syringe and giving her benadryl, as directed by my vet. As the 36 hours were about to be up, and she wasn’t any better, in face possibly worse…I woke up this morning to shower, and went in to find her lying helpless on my floor. She had passed, all because of this harmful drug!! Do not put hartz products on your animals!!!