I applied Hartz Ultraguard Plus Flea & Tick drops for dogs and puppies 60 lbs and over to my 75lb lab mix at 10pm yesterday. Its been a full 24 hours now and no side effects have occurred. Just recently I looked the brand up and saw this website. So I see that it is harmful and sometimes deadly to lots of cats and mostly small dogs. So I was wondering is it even somewhat harmful to a bigger dog like mine? I already washed him several times to get it off of him but its already been 24 hours. Is he going to be okay even though he has had NO side effects yet or should I stay up with him and watch him? I’m really worried please help. Does anyone know how late till side effects start? Even though I washed him he still has greased spots along his back from the medication.