3. Where do I get my pup from?
From a registered breeder who has tested the sire and dam for health problems. All dachshunds are prone to back problems and there is a new x-ray available that assists breeders in choosing the right dogs to breed from. Not foolproof but a good guide. All miniature dachshunds are prone to night blindness. This is called PRA or progressive retinal atrophy and if the dog is tested as affected it will eventually go blind. Similarly if carriers are mated together or mated to affected dogs the offspring will be affected. Ask to see all test certificates. 
When choosing a puppy look for good temperament. See the puppies sire and dam if possible and see if they are friendly and outgoing. 
Buying puppies from pet shops or unregistered breeders means that no health tests are done.