I had to take my cat to the vet this morning and not sure if he is gonna make it. I use Hartz flea drops on him last night to wake up this morning to him having seizures and foaming at the mouth. The vet told me that all hartz flea meds do is kill the animal not the fleas. He also said that was the 4th pet he has had in his office this week from using hartz. Something need to be done to hold Hartz accountable for this product.