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Why Do Dogs Hate the Mailman? (And What Can You Do About It?)

Adrienne is a certified dog trainer and former veterinarian assistant who partners with some of the best veterinarians worldwide.

Why do so many dogs (even the seemingly friendly breeds) seem to hate the mailman?

Why do so many dogs (even the seemingly friendly breeds) seem to hate the mailman?

Dogs and Mailmen

It’s a common cliché: The mailman arrives every morning and Rover starts viciously barking, snarling, and lunging at the gate. The cliché is so common, in fact, that mailmen have started attending seminars on how to deal with the issue and carrying products to keep dogs away. But the use of these products only seems to exacerbate the aggression. But what triggers this reaction in dogs and why do so many dogs (even the seemingly friendly breeds) seem to hate the mailman?

The anger is often not strictly reserved to the mailman; the FedEx and UPS guys are affected as well, and so are plumbers, gardeners, pizza delivery guys, and many other employees who routinely visit your home. What do all these people have in common? And most of all, what can be done to reduce this behavior? Let’s start by taking a look at why dogs don’t like these people to start with.

Believe it or not, you can train your dog not to hate the mailman!

Believe it or not, you can train your dog not to hate the mailman!

5 Reasons Why Dogs Hate the Mailman

We live in an era where dogs can be a big liability and a dog bite can easily cost you your home, the life of your dog and your reputation. My two big Rottweilers weighing over 90 pounds are very fond of our mailman and have even licked and greeted my landlord who one day just popped into our property out of nowhere, climbed over the fence and started painting our home!

Things could have gone really, really bad if I didn't train my dogs to accept the mailman and visitors coming to my home. While my dogs are two big love babies, their size and black-and-tan suit is the only a deterrent (shhhh . . . don’t tell anyone!); we have ADT to take care of the rest!

1. Trespassing Territory

For starters, from a dog’s perspective, mailmen, pizza guys, and plumbers are all people trespassing property. Many dogs, especially certain breeds have a predisposition for passively alert barking or engaging in more actively protecting territory. While the dog may appear for the most part angry, there may definitively be a base of fear.

This tendency possibly dates back to a dog’s ancestral past in the wild when a dog's ancestor formed groups and perceived any invaders as a threat to their resources. They had to protect their resources such as food, sexual mates, and newborn pups from invading animals.

Urine marking was one way to delimitate the area as an olfactory “do not trespass sign”. Trespassers who ignored the scent markings were alerted to back off through barks and then if this did not work, a more active form of aggression took place, leading to a full ballistic attack.

When dogs were domesticated, the dog’s protective nature was further appreciated. These dogs alerted people in villages about dangers such as predator animals or enemies. Nowadays, many dogs are still appreciated for their alarm barks. Yet, a more active role is often frowned upon due to its potential for liability.

Note: Never try to train a dog to become a guardian dog on your own; the issue may backfire the day you are hurt in your home and EMS cannot access your home without facing Cujo. Rather, accept a few alert barks, thank your dog and then take over. Let your dog know that it’s not his responsibility to decide who enters or exits your property, the decision is yours.

2. Mailmen Keep Coming Back!

The whole barking behavior is highly reinforcing for the dog. If every time Rover barks, the mailman leaves (most do sooner or later) he gets relief. Put yourself in Rover’s shoes: let’s say you don’t like cats around your property, so every time you see one coming, you make this hissing sound. Most likely, since the cat leaves, you’ll feel compelled to repeat the hissing sound. But what happens that day you deal with a bolder cat that cares less about your hissing sound? Most likely, you’ll try something else, you’ll hiss and stomp your feet loudly as you move in the cat’s direction. Tada! So, now, you’ll hiss and stomp next time.

So don’t expect the initial barking to just stop there! Since the mailman keeps coming back day after day, don’t feel surprised if Rover starts thinking: what part of my barking you don’t understand? I’m telling you to go away. Ok, let me start showing my teeth too and see if it works!

3. Release of Addicting Chemicals

You may not be aware of this, but fear or anger in your dog causes the release of several chemicals in the dog’s brain. The whole experience can be highly reinforcing and even physiologically addictive. Fear is known for producing adrenaline, whereas, anger causes the secretion of adrenaline and another hormone known as noradrenaline, explains James O Heare in his book The Canine Aggression Workbook. This chemical bath can be quite addicting, which is also a contributing factor to why you see aggressive behaviors repeat over and over.

4. The Behavior Becomes Habitual

What happens when the dogs get to rehearse this behavior over and over? It’s become a habit. Dogs are habitual creatures overall and they engage in behaviors that work. If you combine the three issues mentioned above together, you’ll understand why the behavior of barking at the mailman becomes almost reflexive. Your dog doesn't seem to think twice about it; just the sight or the voice of the mailman is enough to send him in overdrive.

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5. The Behavior Generalizes

Dogs can generalize fear and aggression quite easily. Your dog starts barking at the mailman, then as days go by, your dog starts barking at the sound of the truck honking, and then he’ll bark at the mere sound of his truck approaching your property. Soon you’ll have a dog that not only barks at the mailman but barks also to all the cues suggesting his arrival.

Not only, as we discussed before, he may also decide one day to generalize further and bark even at the plumber, the gardener, and the firefighters coming to save your cat from the tree. Just as a tiny spark can create a big fire, your dog’s behavior can really get out of hand. So let’s take a look at how to tackle this issue.

How to Train Your Dog to Accept the Mailman

So, as you can see, postal workers have their own very good reasons for being concerned when they come by your house. If Rover turns into Cujo the moment you’ve got mail, these tips may be quite helpful.

Start Early

You can’t start early enough for this type of training. Place a nice cookie into your mailbox and tell your mailman to deliver it to your dog every morning. This will create positive associations with the mailman. This way, your pup will grow to love him and will be eager to see him each day!

Prevent Rehearsal of Behavior

If you missed the boat and failed to make your mailman the perfect representation of a friendly man, then you have some big homework to do. The first step is to prevent rehearsal of behavior. As mentioned, aggressive behavior is reinforcing and on top of that addicting and habitual. The more your dog rehearses the behavior, the more it will put roots. Stop letting your dog out to send the mailman away. Start keeping him in your home in the farthest room possible when you know it’s time for mail delivery.

Go Gradually and Create Positive Associations

Of course, secluding him in a room while the mailman arrives does nothing to fix the behavior but at least it prevents your dog from rehearsing it. This is a big start. Your next step is to then classically counter-condition him to associate anything about mailmen with good things. To accomplish this, I recommend that you read these articles:

In short, you’ll first have to first find a distance where your dog doesn't react to the mailman’s truck noises (under threshold), secondly, you’ll start by gradually and systematically working on the issue through exposure (desensitization), and third you’ll have to change your dog’s emotions about the mailman through classical counter-conditioning through a program such as COR or open bar/closed bar.

Once those positive associations are made, you can shift into operant counter-conditioning by training your dog on an alternate, default behavior (differential reinforcement of alternate behaviors) A sit or automatic watch works fine in this scenario. Basically, with time, your dog may learn to sit or watch you (as in COR) instead of barking and aggressing.

This system works because from being a foe, the mailman, gardener, or pizza guy becomes your dog’s best friend. In her book The Cautious Canine, Patricia McConnell suggests having the pizza delivery guy come to your home and deliver a slice of pizza just for your dog.

As your dog’s emotions change internally, you’ll also see the outward manifestations gradually vanish. This means with time, your dog will no longer feel the need to bark/growl/lunge. While in the wild dogs acted territorial to protect resources such as food, now your mailman has become an actual source for resources!

When Territorial Behavior Is Really Frustration

Some dogs that appear to act out of territoriality are actually frustrated greeters. These are dogs who lack self-control and will bark because they are frustrated by the fence. If there was no fence, these dogs would run straight towards the mailman and just greet him as a long-lost friend.

If your dog is a frustrated greeter, work on establishing self-control through the Premack principle. In other words, ask your dog to sit or another command before he goes towards the mailman and once he sits, the mailman can toss a stuffed Kong or a bone you have left in the mailbox for the mailman to deliver.

This Cute Dog Really Loves the Mailman!

This article is accurate and true to the best of the author’s knowledge. It is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from a veterinary medical professional. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

© 2013 Adrienne Farricelli


Adrienne Farricelli (author) on September 25, 2018:

Andrew, so sorry to hear that. Are carriers still entering through gates where there is a dog loose in there? I hope not, as that's surely a scary and potentially dangerous situation.

Andrew on July 07, 2018:

Letter Carrier here. We are explicitly forbidden by management to feed dogs treats. DO NOT ENCOURAGE CARRIERS TO DO THIS. I am not the only person who carries my route. I have a regular sub who carries on my day off and any number of different carriers may carry my route when I am on vacation. If the dog assumes the carrier has a cookie for them, they rush toward the carrier, often scaring us into thinking the dog is attacking, and boom: you're getting a call from animal control and your mail stops being delivered.

Meg on October 01, 2016:

My dogs love my husband friend who delivers for ups unless he is in any of his work clothes they bark and growl. Wondering if it's all different scents?

Adrienne Farricelli (author) on August 22, 2014:

That's cute SusannaDuffy, my cat used to love waiting for the pizza delivery guy. She loved pizza.

Susanna Duffy from Melbourne Australia on August 22, 2014:

My cat, slaughter in his heart, lies in wait for the mailman. Fortunately my cat doesn't bark

Adrienne Farricelli (author) on December 14, 2013:

Hello bipolartist, it would be ideal if you could give your dog treats when he sees the mailman, this way the mailman is safe, or have him toss a cookie from behind the fence.

Amy Magness Alaoui from United States of America on December 11, 2013:

So glad I found this hub. I will be writing an apology card for our mail carrier tomorrow because he is new. Our old mail carrier changed locations and though our dogs despised her, it is nothing like the ire they feel over this one.

If they could, they would shred him. I will ask about the "cookie" solution and see what he says.

Great hub.

Adrienne Farricelli (author) on July 06, 2013:

That's the coward approach, they feel like their barking is what's sending you away and some will even bite when you turn your back to them. Many do that to dogs as well, they will bark at them the moment they make an about-face and are about to leave.

Mel Carriere from Snowbound and down in Northern Colorado on July 06, 2013:

Very interesting points. I am delighted that you recognized that not every dog hates the mailman - many of them love the mailman and are all sweetness when he comes by, even when they bark at others who stroll through the neighborhood. One dog I know likes only the mailman and barks at everybody else. One question: There is a dog I know that is very nice when I show up in the yard, but begins to bark at me when I start to walk away. I have noticed this behavior in other dogs too - some of them only bark when you are leaving.

Adrienne Farricelli (author) on January 26, 2013:

Hi Giblingirl, countless dogs are that way, it's highly reinforcing behavior and as mentioned even addictive. Thanks for stopping by!

GiblinGirl from New Jersey on January 25, 2013:

My dog goes ballistic every time the mailman, or anyone, walks in front of our house. Thanks for sharing these tips.

Adrienne Farricelli (author) on January 23, 2013:

That's awesome lipnancy!

Eiddwen from Wales on January 23, 2013:

Very interesting and thanks for sharing.

Nancy Yager from Hamburg, New York on January 23, 2013:

Many of the delivery people in my area carry treats so the dogs are friendly toward them.

Adrienne Farricelli (author) on January 23, 2013:

Hi Lawrence, thanks for stopping by. It's great your dog has a good relationship with your mailman, that's how I think it's supposed to be. Mailmen have so many bites incidents and the sprays and other deterrents they use make only matters worse, Great tips for the outside mailbox!

Adrienne Farricelli (author) on January 23, 2013:

Lol, wetnose, some dogs love mail so much they shred it to pieces!

Adrienne Farricelli (author) on January 23, 2013:

Hi Moonlake, some dogs also don't like uniforms, hats and other things that change our shapes. They're always animals which at times can be a bit unpredictable. My dog once growled at a lady who wore a really thick pair of glasses. That was the first time I saw him do that and it shocked me too!

Lawrence Da-vid on January 23, 2013:

My shepherd tolerates our mailman.....she has to, he's a government employee, and so are we. Our mailman or person, is on an intimate relationship with her. If a different mail person comes to the door, el-mutto flies off the handle, barking, snarling, and snapping at air. I attribute this reaction to an unknown individual intruding on her domain. It's "her" area that she's protecting, and most dogs react the same. by being there when the mail person arrives, an introduction between the two can resolve the situation. Then it does not become an intrusion, but a visit. As for having a mutt that destroys mail that slides through a mail slot in the door.....install an outside mailbox.

wetnosedogs from Alabama on January 23, 2013:

That video is awesome.

I know someone who has a mailslot through her door. The dog is inside and the mail comes through and the dog grabs the mail and makes garbage of it!

moonlake from America on January 23, 2013:

UPS called us one day and ask us to put our dogs away before they came. I couldn't blame them our black lab was pain he did not like the UPS man and he would growl at him. He lived 14 years without ever biting anyone but he could sure scare people. Our Springer would never do anything but one day the UPS man came and I walked out to meet him with my Springer. He said is your dog ok I told him he was but as soon as the man stepped towards me the dog stepped between us and growled. I was shocked. He had never done anything like that. Now he greets the UPS man as if he's been his friend forever. Voted up on your hub.

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