My chickens have a bad infestation of lice and possibly mites. I used Elector PSP three times, but it didn't seem to be very effective. One of the workers at our local Agway feed store recommended Prozap Garden and Poultry Dust. It contains permethrin. After reading the label, I became a bit concerned about using this product. Directions say to wear long pants, long-sleeve shirt, gloves and a NIOSH approved respirator with a dust filter. That in itself is a bit intimidating. If I can't breathe it, how can it possibly be safe to use on my hens? I can't put a respirator on them as I apply the dust. I also read that permethrin is toxic to cats. My cats often follow me into the coop. Has anyone had any experience with this particular product? My thought right now is to return this product and use something like a tick and flea spray. Any suggestions?