We bought this product after finding a flea on our female boxer. We gave the treatment to two of our three boxers and they became sick and threw up during the night. When we got up the next morning, the female was still sick to her stomache, and our two year old male was so sick that he could hardly walk. It seemed like he was having trouble with his balence. We called our vet and she recommended that we call Sergeants and tell them the situation so we did. This was the biggest waste of time that I have ever seen! They acted like we... read full review »