My dog was having a flea problem last year, so I got the Hartz ultra guard flea and tick shampoo. She began drooling for the next two days, excessively. She became more and more sluggish, and the drool turned to foam. She was dead three days later. I didn’t make the connection with the flea and tick shampoo until I saw a Facebook post with the exact product I still had. I’m angry and upset that a product I purchased to make McKenzie more comfortable actually killed her.