My Zoey has a docked tail. Zoey's tail is more than a nub for sure, it is about the length of my pinky maybe a slight bit shorter... I can definitely see her wag!
I must admit that all of my research began AFTER I had put a deposit on her. I was horrified to hear her tail had been docked.
Now that I understand it is a common practice, I understand however, if given a choice in the future - I may opt to not have it docked. I do not plan to show nor breed thus, as humane as possible would be my preference. I must admit however, I have not concluded my research and maybe there is a justification (e.g. health issue) that warrants such a docking.