I went and got out my "Getting in T-Touch With Your Dog" book. This is the one written by Linda Tellington-Jones. The only thing I see in here about tails is, and I quote....
That didn't go into any detail of any kind of incontinence issue etc.
Edited for spelling..
"The (Tail) T-Touches are especially beneficial for animals with docked tails. The tails of some of these dogs are very stiff because they still retain the cellular memory of fear and pain from the docking surgery. In a case like this I reccommend going over every square inch of the tail with small Raccoon TTouches. Pay special attention to the stump in order to remove any phantom pain. Move the tail in tiny circles. If you can loosen up a tight tail, your dog's range of motion and resulting self-confidence will greatly increase."
Edited for spelling..