This behavior is known as fear aggression, oft times this can be dealt with, with
training, sometimes maybe not. I have been there with a Border Collie, Mac was our third Border so we were familiar with the breed, we went through several classes with him including one with a trainer familiar with this condition to no avail at 16 months we put him down ( very painful on all of us )after he had bit me in the face for the 4th time and this was after i had played with and been involved with his training from the time that we got him at 12 weeks old. Such a waste !
Here is a photo of my two buds Molly and Moe, you will get over it if that is what you have to do to Lucy, these two are how we got through it,although it still hurts to this day.
