my backyard has millions of fleas. i opened my sliding glass door tonight for about 30 seconds and noticed there were hundreds of fleas that had jumped on my legs. and that was just outside my door. the backyard is about half and acor. we have to dogs that i have put in the side yard to quarinteen them from the infestation. i have tried a spray you attatch to a hose and spray all over to kill them and i do that every 2 days but it doesnt seem to help. how do i get rid of all these fleas?