Lisa, our Lani is 5 months old and goes into Cujo mode also. We will put her in a time out in her crate with a treat (thanks to a suggestion on this forum) and tell her to settle with no anger. After a few minutes we let her out and she usually remains calm. She has been jumping on people also, we will crate her untill she can settle down, then we let her out and willput her back if she starts again. Our obedience instructor says she is a rebellious teen right now and just to be consistent with what we do and persistant. Good luck, we figure this too shall pass.