We put hartz flea drops on our dog sky, the next day there was a spot of throw up, we did not think anything at the time, maybe he ate grass, even though he had never thrown up before. The next day there was throw up everywhere. Sky was letheragic, would not eat or drink. We immedialtly rushed him to the vet. The vet said he had acute renal failure. His kidneys where shut down and it happened fast. We did everything we could to save him, he had water therapy, by IVs. He was also put on medication, nothing worked. Two days later Sky was put down because he could no longer eat, goto the bathroom, or walk! We are devestated! PLease stop Hartz.