Hartz product sent my cat into seizures. It was the only change I'd made in his diet and within 10 hours of using the product he was seizing. I rushed him to the vet, with the Hartz packaging and the vet confirmed the Hartz caused it. $700 and two days later, my pet was out of danger. No Hartz product is worth the risk. FYI, the vet also told me he saw several dogs per week with Hartz caused problems. Really, find other product.