Vet is also confounded, but has agreed to give me Revolution, says I can start it at any time because it's completely different from Ivermectin. (Which I think it incorrect -- isn't Ivermectin a derivative of Revo or something like that?)
From his perspective, he expects Revo will do nothing because he took a scraping and it showed no mites, and Skittles shows no signs of mites, and the ivermectin didn't work. I've told him about what I've read how some rats do not respond to ivermectin anymore, and since we don't have a clue what else to do, we might as well at least try it.
Anyway, having had dose #2 of ivermectin just a few days ago, would you still believe it's safe to give her revolution today?