I used the product Hartz Ultra Guard rid flea and tick shampoo on my dog last night. By the morning, he was acting very different..he was not playful like he usually is and did not even want to go on a walk. Later during the day, he was very weak. He has not eaten since, could not jump on and off couches and threw up as well. Finally after reading posts on how bad this product is, I rushed him to the vet where he will be for two days. I am hoping so much that he will be ok This product should not be on the market anymore!