If he isnt problematic with your family, I DON'T see a big issue. As with lawsuits...yeah in some places you can get sued if some burglar decides to terrorise your home and your loyal dog protects you. I read somewhere that a dog got put to sleep as agressive for biting an intruder into someones home when the owner wasnt present. The dog was inside and secure, the burglar entered without permission and with force and the dog still was put down. Dumb law if you ask me...in Nevada, the dog is safe because the law is is that if someone enters into your home without permission, its legal to restrain him and/or stop him using forcel...acts of dog are included although THAT's being challenged now *groan* I know Im darn glad when my Twilight baby gaurds my house! People shouldnt be punished and dogs shouldnt be killed just for doing thier jobs...I can understand being uppity about acts of aggression without provocation though.
As for the other advice...it is good. Overagression is a trait to avoid as well...dog behaviorists can really help. I heard that dachsunds are a little high strung...Is this true to anyones knowledge?