A dachshund was bred to go down a hole alone, make its own decisions in the dark, and keep going when a badger told it to stop. That is the temperament you have living with you: brave out of all proportion to its size, self-directed, and not naturally inclined to look to a handler for instructions.
The flip side is intense attachment. Off the job, the dachshund is a "velcro dog" that wants to be on you, under a blanket with you, or at minimum in the same room. Many are prone to separation anxiety and need deliberate training to be left alone calmly.
Stubborn, or just smart about incentives?
Dachshunds are intelligent but not obedient in the Border Collie sense. They learn fast what earns a reward and will happily ignore a cue that doesn't. Trainers call this "what's in it for me?" and the answer to good dachshund training is: make it worth their while, keep sessions short, and never get into a battle of wills you can't win.
Harsh corrections backfire badly. A dachshund that feels bullied gets more stubborn, not less, and can become defensive.
The bark and the dig
The voice is not a bug. A working earth dog barks to be located underground, and pet dachshunds bark at doorbells, passers-by, other dogs and interesting sounds with the same conviction. It can be managed but rarely eliminated.
So can the digging. Garden beds, sofa cushions and the duvet are all fair game. A sandpit of their own, or simply accepting a few excavations, keeps everyone happier than trying to suppress the instinct entirely.
