My dog Lola, (a 3 year old mutt) had fleas, so I bought the Hartz Ultra Guard Plus Flea and Tick Drops. I read the entire label to make sure that I was taking every precaution needed and then I put it on her just as directed. She almost immediately started whining and panting and I wrongly assumed that it was because the smell was making her uncomfortable. I left for class and about an hour later I came home to find her yelping, panting, whining, shaking, and rolling around on the floor trying to rub her back on the carpet (where the drops were placed). I have never seen her in so much pain; it seemed almost like her skin was burning. At first I thought maybe the medicine was killing the fleas and so they were all biting her and putting her in pain but it just wasnt going away. After realizing that this had gone too far I decided to give her a bath to wash off the medicine. The first half of the bath she was whining and shivering and panting all at the same time and then after scrubbing her down a few times she began to calm down and act like her normal self. Right now she is laying down relaxed, 100 percent different from when she had the medicine on her. I researched this product to find out what went wrong and found this site and started crying after thinking that if I had been gone all day at work then I would have risked my dogs life because of this awful product. I am so lucky to have been home so quickly and realize what was going on before it got that bad. Something has to be done about this product, this is NOT right!!!