So my dog has been itching like crazy for the past month and chewing to where it was getting infected. We’ve taken her to the vet to get everything figured out. Shes gotten better but still is itching a lot. Yesterday I figured it might be because I haven’t given her any flea medication since November. I has the Hartz flea and tick drops so I used those. Instantly after putting it on Barley, she was running around the house like crazy with her tail sticking out. She finally started to calm down then ended up throwing up. I thought she was just had a stomach ache. Later on that night I noticed that she had a major rash on her stomach and the base of her tail. I thought she might of gotten bit by something since she was outside rolling around. This morning I came home from work and her ears are all swollen, along with her face, legs, and paws. The rash had gotten worse. We took her to the vet and I told him I put this stuff on her. He immediately knew she was having an allergic reaction to the Hartz. He gave her an injection which is making the swelling go down. I’m so glad we caught it in time. I don’t know what I would have done if something happened to her. I just wish I read all these storied before I used this on her.