I used sergent's gold fle and tic on my two dogs witn in 1/2 hour I was on my way to pet emergency clinic with both dogs they were whining scratching and were in pain and cant sit still for very long they have stop eating and drinking water this was the frist day on the 2 day theres no change so back to the vet the 3 day I am back to pet emergency again . for 3 days now I had to take them in for shots just to get them to stop paceing back and forth and pulling there fur out . this stuff what ever they put in it is so bad and they know it 's poison . there is no warning or side effects listed . this should not be sold . please stop buying there products and tell all your friends who have pets about there products and how they can hurt or poison your pets