what do you use for fleas both cats and dogs....i used promeris last year. it is strange it paralizes the jaws of the fleas and they starve to death...jumping about the whole time, so if you dont get it on them before the fleas...the dogs and cats go nuts with the jumping fleas. do you rotate meds for fleas and if so how? do you give heartworm pills? i do but only every 6 months and only as long as the breeding cycle of skeeters is still going on. i stop in the winter. so what have you found best for indoor and outdoor dogs?