I have a mini Doxen. Three weeks ago she started to have severe pain on her under belly. Every time we would pick her up she would yelp as if she is in a lot of pain. Now three weeks later she is arching her back as if somebody has just kicked her. She is now having a very hard time walking. She almost has to drag her back legs as she is doing this. My question is this common or do I have a serious problems. What is the best course of action?

If your dog has not improved in three weeks she really needs to be seen by a vet.

Back problems are all too common in mini Dachshunds, some more serious that others, and some more treatable than others. Aside from a vet visit, keep her lean. Evaluate her using LongLiveYourDog.com - Life Span Study - Rate Your Dog (http://www.longliveyourdog.com/twoplus/RateYourDog.aspx) Have the vet confirm your judgment. Adjust her food and exercise as needed. If her activity is down, the food needs to go down.