You can control what you get off the skin with a dubbing rake. If you change the angle you will change the percentage of guard hairs to under fur. So if you want spiky dubbing then take more guard hairs. The very best dubbing rakes were those made by Lawrence Waldren the Ceramiscrape. However they are no longer made. You may find them, but undoubtedly at a premium price (You aint gettin' mine).
As others have already said tail hair isn't a great material for dubbing.
Cheers,
A.