Ok, so I was researching flea and tick brands prior to buying a preventative for my dog for the first time (we rescued her in the winter). I read horrifying things on this site. To be honest, I did buy the Hartz Ultraguard Pro drops because they are so much cheaper and if you look at the ingredients, it’s pretty much like a generic of Frontline or K9 Advantix. My dog survived her first of three 30 day doses with zero side effects. And she is 30lbs and I gave her to 30-60lb weight drops not the 15-30. This site scared me and it was all for no reason. Of course some dogs are going to have different reactions to chemicals just like people. But all these stories are either fake or super exaggerated.