I guess they all do that a bit.
This is an interesting article about special project dogs - with problem behaviours that they may have been born with, may have been caused by trauma or just owners who didn't know any better (me).
The Project Dog
The Good: A Project Dog makes you look seriously at your skill level in your work with your dog. You have to review and evaluate how you work with this dog. A Project Dog should force you to research and read everything you can get your hands on about how to work with their specific issues. AND you will have to bring ALL your skills at analysing what is and isn’t a solid strategy for dealing with this particular dog.