In general, we recommend that a Dachshund should be left alone for a maximum of 4 hours. This applies to an adult dog. Of course, he must have access to fresh drinking water at all times during the time he is left alone.
Puppies and young dogs must be socialized before they can be left alone. Otherwise, there is an increased risk of separation anxiety, destructive behavior and excessive barking. During the first three months, your Dachshund should never be left home alone for extended periods of time. Approximately from the fifth month of life, in our experience, the targeted habituation to being left alone can be started.