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did you leave the shampoo on him for 5 minutes or more before washing it off? if not then that's the problem, you have to give the pyrenes time to set in and work.
if you did leave it on then you need to get a spot treatment,ie: Frontline, Harts, Adams, etc.., or have your dog dipped. I know the past couple of years the flea and tick population have almost become armour plated when trying to treat them. last year it seemed like nothing worked that we sold in the store. It seemed like the only way to kill them was to dip the animals.