These three articles that I wrote will help:

http://www.veterinarypartner.com/Content.plx?P=A&A=1811&S=1&SourceID=47

http://www.veterinarypartner.com/Content.plx?P=A&A=1612&S=1&SourceID=47

http://www.veterinarypartner.com/Content.plx?P=A&A=1669&S=1&SourceID=47

This dog is at a stage critical to adult development. If he's not neutered, get it done very soon. If the articles don't get things going very well, very fast, ask your veterinarian to recommend a local behavior specialist--someone who will use only positive handling, not punishment.

Dachshunds may look small, but they are a lot of dog! Get those ladies on the right track, and I expect this dog will be okay. But do not delay!
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47