My husband purchased Hartz Ultraguard for our 3 year old calico cat, Meelah. Immediately she began racing around the house, panting, hissing, furiously licking at the nape of her neck, hunching down to heavily breathe. We brought her to the bathroom and rinsed her off but because she has some serious claws on her, we didn’t get soap done before having to let her go. My husband continued to rub the nape of her neck with a wetted towel. She is breathing normal and napping now and does respond as normal when called, but we are still going to watch her over the day because of the licking and ingesting of product.