My 4-year-old dachshund barks at the doorbell like someone's breaking in. I've tried saying 'quiet' but he ignores me and keeps barking. It's been going on for

Yes, but it'll take 4-6 weeks because the behavior is deeply rehearsed. Saying 'quiet' does nothing — he's in alert mode and can't process commands. You need to recondition the trigger. Unplug your real doorbell for now. Get a doorbell sound recording on your phone. Play it at 10% volume. The moment he alerts (perks ears, looks toward the door), mark it with 'yes' and give him a high-value treat before he barks. Repeat 20 times over two days. Gradually increase volume by 10% every two days. You're building a new association: doorbell = look at me for a reward. Once he's turning to you reliably at full volume, add distance — practice from different rooms. Then reconnect the real doorbell and practice the same way. If he barks at any point, the volume or intensity was too high. Drop back and build more reps at the previous level. Dachshunds are stubborn and alert-driven, so consistency matters more than speed. Miss two days of practice and you'll backslide.