Gave my 2 cats Hartz Pro Gaurd flea drops. Immediately one started running frantically and began drooling after about 30 minutes. I began to research this as it was too late for their office to be reached and found this website. Immediately I washed it off of him and tried to wash it off of my other cat (who was not showing poor side effects). In the morning I woke up to her entire head covered in saliva and she was shaking uncontrollably. I rushed her to the vet where they treated her with fluids and meds. It is scary and sad retailers continue to carry these horrible products.