Jack, I think I have your Tenn version of fleas.
You other guys describe my place too. Fleas all over one dog, dog next to her won't have a damn flea. Crazy stuff.
I'm band aiding the dogs right now with spray and spot on. Empty houses right now (barrels). As soon as work allows, I'm spraying the Chlorpyrifos, scrubbing and treating the dogs and bedding and see where it takes me