I don't know if you can use Bitter Apple actually on the tail, but that stuff works to keep Gracie Ruth from chewing on things. Of course I don't have a problem with her chewing on Boo. He'll tell her to quit if she gets too pushy.
It will probably take some training, but I would think that you need to intervene and take her away from Sassy. Give her something else to focus on chewing besides Sassy's bum. |