Recently, my parents rescued a stray dog and found him a good home. Unfortunately, “Charlie” as we called him, brought fleas into the house. When our kids and our dachshund, Niles, spent the night with my parents- he came home with the fleas. I purchased Hartz Flea and Tick collars for my dog and cats, as well as for my parents’ cat. My orange tabby started to act weird immediately. He was lethargic, and when his condition didn’t improve overnight, I turned to the internet for answers. Thank you for this website… I immediately cut the collars off of all of the animals. All of the animals seem fine… the one affected the most, the big orange tabby, is already back to himself. My parents’ siamese, Scarlett, wore the collar for just a few short hours and you can see a pink spot where it irritated her skin. Shameful that these companies are still in business…. but thank you for getting the word out there. My many sympathies to those of your whose animals were seriously injured or killed by these products. ?