My 3 year old dog was rushed to the Vet this morning after using Hartz flea and tick drops. She had egg sized welts all over her body and head. She was treated and sent home and now is on close watch. The welts are coming and going with no warning, even now after treatment. The vet has her taking medication twice a day to help. It’s heartbreaking what Hartz has allowed and even promoted when they know there have been issues with their products. I feel like I’ve paid them to harm my dog, I’m digusted!!!!