Let your dog announce the visitor, then teach it to stop

Quick answer: Let your dog bark three times. Say "thank you," walk to the door, and send the dog to a mat. Reward the mat, not the silence. Plan on a couple of weeks of short drills.

Stop trying to cure it

Most people come at door barking like a leak. They want it gone. But a dog that notices a stranger on your porch is doing one of the oldest jobs a dog has. Take the job away completely and you've got a confused dog with nothing to do and a doorbell that still sets it off.

So don't ban the alert. Cap it.

The goal is a dog that says "someone's here," hears you say "I've got it," and stands down. It's the same deal you'd want from a good employee. Report the problem, then let the boss handle it.

The three-bark rule

Pick a number before you start. Three works. Two or three barks is a real alert, and four or more is a dog that's decided it's in charge.

The moment the dog barks at a knock, a car door or a delivery truck, walk toward it calmly and say "thank you" in an even voice. Not loud. Not sharp.

That's the part people get wrong. If you yell "quiet" over a barking dog, the dog hears a second voice joining in. You've barked along with it. A flat, calm "thank you" tells the dog the message was received, and a message that's been received doesn't need repeating.

Then you have to give the dog something else to do. That's the mat.

Build the mat first, without any door in sight

Don't start with the doorbell. Start in the living room on a quiet afternoon.

Get a small rug or a bath mat. Put it down about six feet from the front door. Hold a handful of pea-sized treats, and the moment the dog puts a paw on the mat, say "yes" and treat it on the mat. Let it step off. Wait. When it steps back on, say "yes" and treat again.

Ten repetitions, a few times a day. Within a couple of sessions most dogs are throwing themselves at that rug like it's paying rent. Now add the word. Say "place" just before the dog steps on. After a few more sessions, say it from across the room and see if the dog goes.

If you've already worked on sit, stay and come, you've done half of this. A solid stay on the mat is what makes the rest work. If you're starting with a young dog, the habits in the first seven days with a new puppy are the right foundation.

Add the door, slowly

You need a helper, or you need to fake it. A phone playing a doorbell sound works for the first rounds.

Start at low volume. Play the sound, and before the dog gets to barking, say "place." Treat the dog on the mat. Keep the treats coming for a few seconds while the sound plays again, then release with "free."

Over several days, move up the ladder one rung at a time:

• Louder doorbell sound
• A real knock from outside
• The real doorbell
• Someone opening the door and stepping in

Only move up when the dog gets the last step right five times in a row. If it falls apart, go back one rung. That's not failure. That's just how it goes.

When you get to real visitors, put the dog on the mat first and ask the guest to ignore it until the dog is calm. A guest who bends down and squeals at an excited dog undoes a week of work in about four seconds. Tell them ahead of time. A good friend won't mind being told.

What goes wrong

The dog ignores the mat. The distraction is bigger than the reward. Use something better than kibble. Small pieces of cooked chicken or cheese work. Save them for this drill only.

The dog goes to the mat and keeps barking. You're asking for too much too soon. Reward the instant it's quiet, even for one second, then build to two, then five.

The dog barks at every sound outside. Management helps. Frosted window film over the lower half of the glass cuts down the show that sets the dog off. A fan or a radio in the front room covers some of the street noise. Neither fixes the habit, but both lower the number of triggers while you train.

You're the problem. If you sometimes say "thank you" and sometimes shout, the dog learns nothing. Pick a method and run it the same way for two weeks. Consistency is the whole trick, and it's the part that costs you something.

Your breed was built for this. Herding dogs, terriers and guardian breeds were bred to sound the alarm, and some will always have more to say than a retriever. They can still learn the cap. It just takes longer, and you'll be running those drills for the life of the dog. If you're still choosing a dog, match the breed to your house and yard before you fall for a face.

When it's more than a habit

Some barking isn't training trouble.

If an older dog starts barking at nothing, at night, or at the door when nobody's there, call your veterinarian. Hearing loss, pain and age-related changes in the brain can all show up this way. An old dog's needs change, and sometimes the bark is the first sign.

The same goes for any sudden change in a dog that's always been calm. A vet visit comes first, before you spend a dime on a trainer.

And if your dog lunges at visitors, snaps, or won't settle for hours after someone leaves, that's past a doorbell drill. Talk to your vet and bring in a qualified trainer who works with fearful or aggressive dogs in person. Don't try to fix that one from an article. Nobody gets bitten while you figure it out.

What a quiet house is worth

A dog that alerts and then stands down is a good thing to have by the front door. It tells you who's coming. It doesn't replace a good lock or good judgment, but it gives you a few seconds you wouldn't have had.

The dog's job is to tell you. Yours is to say you've got it from here, and mean it.