All seven of my chickens have been showing signs of some sort of mite problem, though I have never seem or felt the bugs around. They have feather loss (bare butts, bare neck) as well as half broken feathers on their backs. I thought they were pecking on each other (though I never saw them do it), but they have been wearing "pinless peepers" for a month and the bald patches are getting worse on some of the hens. I have no roosters. They have been having these problems since mid winter. I'd like to get their feathers to grow in before next winter, or they'll freeze to death! So I'm guessing it's some kind of mite, though I can't see the buggers. I read about feather mites, and I think that might be it. I've tried all the regular stuff -- DE, sevin dust, etc. and it hasn't had any effect. They eat a healthier diet than I do, tons of protein and nutrients. They have lots of room and are otherwise healthy. They aren't molting. They take dust baths in DE all the time. So now it's time for the big guns, chemically speaking, I think.. I just bought a lot of Frontline Plus for my other animals.. I buy the Large Dog size and measure out the correct dosage for my cats and dogs. I read about a Frontline spray which is approved for chickens.. has anyone used it? Has anyone tried to use the regular Frontline (for cats and dogs, in the little tubes) for chickens? I'd love to make use of what I already have, if I can. But I don't know the dosage. And regular Frontline is slightly different from Frontline Plus.