I have three (spayed) 6 yo female lab triplets that are scratching and biting themselves around their hips (the area just behind their loin and just above their thighs). My neighbors dog (a beagle) is doing the same thing. Now, I have a friend who has (if you can believe this) 13 dogs! When I mentioned the problem to him he said, "Yeah, mine too. I've heard there's a super flea out there that is impervious to Frontline and other major flea and tick remedies. There's nothing you can do." With 13 dogs and upwards of $30,000/yr in vet bills, I tend to believe he is fairly well informed. I on the other hand, don't even make $30K a year. So before I start running up a lot of vet bills, what can I do at home? I've used Frontline, bathed them with several different kinds of dermatologic shampoo, added supplemental nutrients to their food, and have applied various topical solutions to the affected areas. Thank you in advance for your comments and/or suggestions?