I used Seargants silver on my dog and immediately he started itching. Within a day, he itched himself raw and was constantly crying and running in circles. His hair fell out and had literally itched the skin off his back. I took him to the vet where she called seargant’s for advise. They told her to put vitamin E on it. Yeah, like vitamin E is going to help. after two trips to the vet and a week long of my dog in constant agony, he finally started to take a turn for the better. Seargant’s did nothing but reimburse me for the product saying it was my fault the product failed because I used it incorrectly. HELLOOOO….how can you put flee medicine on a dogs back incorretly? I am FURIOUS and will NEVER use anything of this brand ever again. I highly advise everyone boycot this manufacturer and put them out of business.