My 4 month old puppy got a chemical burn from hartz flea collar. Luckily we found out about it and took her to the vet right away. The vet told us the burn had just started so it wasnt that bad. He even told us that one of the ingredients will cause seizures in dogs and that the packaging says avoid contact with skin but you’re supposed to put it on the dog’s neck?? Doesnt make any sense and I genuinely dont understand how hartz is still allowed to be selling all these product!s! I am really angry and upset. Not only was it painful for my pup, we had to spend $280 at the vet for it. Never use hartz flea collar on your pet, ever!!