If they move really fast and you see thickness at the base of their feathers it's lice (these are the eggs). Otherwise probably mites. Both killed by bathing with and treating environmental causes. I use diatomaceous earth and neem oil with a mix Of peppermint, oregano, lemongrass, and clove...
That's so incredibly sad. I hope you get a resolution soon. I've felt that loss and it's visceral. I feel that the owners should be held responsible because even if you destroy the dogs, they will most likely replace them with more if the root of the problem isn't addressed. I would call the...