Birds use a variety of materials to build their nests, and that definitely includes pet fur. Usually, there's a process: Dog sheds fur, bird picks up fur and builds nest.
But not on this day.
In fact, this senior Australian shepherd named Cindy doesn't seem to mind as the bird yanks out tufts of her fur! Mellow Cindy doesn't even look the bird's way. (Maybe she needed a brushing?)