I agree... many of us (myself included) have been guilty of inducing
Small Dog Syndrome on our doxies.
We have been able to reduce many of these problems in our 13 year-old male (Max) just by following the principles from Cesar Millan's "Mastering Leadership" series.
I know that Cesar is sometimes a controversial figure in dog circles, but most everyone can agree that his basic principles are sound.
Just learning to walk our dog the right way made a huge difference in his behavior in less than one week! We even walked within four feet of a pit bull the other day and Max just ignored him. Our calmness even calmed the pit bull down... it was amazing! Previously Max would lunge at anything that moved no matter how big it was.
I disagree with people who say that dachshunds are "mean" or "inclined to bite"
I think that dachshunds have many of the characteristics of some of the more powerful breeds... they are just very compact!

But we treat them like "little dogs" and let them run all over us and then seem surprised when they act dominant/aggressive