Oh no poor baby! It looks so much worse than I thought.
Maybe Boo have something going on? Or is it normal for her to be that nasty? Seems so untypical for a lab to bite like that.
Healing thoughts for miss Twiggy. Good thoughts for all of you. (((HUGS)))
(ETA: After reading your other post, she has done it before, it's probably not medical... Seems like something has happened but not sure what. So heartbreaking. Try to keep them separated all the time, can imaging that's not easy. Good luck.)