We foster dogs and had a stash of this Hartz Gold on hand. We had never used it then we got a dog that was infested with ticks so we put it in him, and our three others. Three were fine but our poodle started screaming within an hour, running around and thorwing himself into the walls. He was so scared he ran down our hall peeing and pooing!! And he’s houstrained! We’ve spent all night with him, called the poison control center and everything. We’ve given him bathes with dishwashing soup (as directed by others) and still he’s in massive pain. Someone needs to start a class action against Hartz for this. Why this product is still on the market is beyond me!!