Royal Mail's dog warning campaign: why your dog attacks delivery people and how to help

Royal Mail recorded 2,197 dog attacks on postal workers in 2026 — roughly 42 incidents every single week — and has relaunched its Dog Awareness campaign, asking residents to mark their homes with yellow dot stickers and "I have a dog" postcards to warn delivery staff before they open the gate. But behind the campaign statistics lies a question every dog owner should be asking: why does my dog attack delivery people in the first place, and what can I actually do about it?

The veterinary science behind the doorbell dash

Dogs that lunge or bark aggressively at postal workers are not simply "badly behaved." The behaviour is rooted in a deeply ingrained psychological mechanism that most vets call the extinction burst — and understanding it is the first step toward solving it.

Here is what happens: your dog sees the postal worker approach, barks, and the postal worker leaves. From your dog's perspective, the barking worked. The "threat" retreated. This pattern repeats daily, sometimes twice a day, and with every repetition the behaviour becomes more deeply reinforced. Over weeks and months, your dog's brain literally rewires itself to treat the delivery person as the most reliably defeatable intruder in existence.

The problem is compounded by the territorial window — the front door, letterbox or garden gate. Studies published in the journal Applied Animal Behaviour Science show that dogs display significantly higher aggression levels when threats approach a defined boundary compared to neutral environments. Your dog is not aggressing against a person: it is defending what it has learned is its core territory.

Warning signs that go beyond barking

Barking at the postman is common and often manageable. But some dogs escalate, and it is important to recognise when the behaviour has crossed into territory that requires professional intervention:

• Lunging or snapping even when the person has not yet reached the door
• Redirected aggression: the dog turns on a family member or other pet after the delivery person has gone
• Sustained arousal: the dog remains agitated and pacing for 20 minutes or more after the trigger
• Barrier frustration that escalates: increasing damage to doors, gates or fences over time
• Body posture changes: stiff tail, raised hackles and a low, fixed stare rather than excited, bouncy barking

If you recognise two or more of these signs, a consultation with a veterinary behaviourist or a vet experienced in canine behaviour is strongly recommended before attempting any home training programme. Self-managed desensitisation, if done incorrectly, can make the problem significantly worse.

What your vet can do

A vet's involvement is not just about whether to prescribe medication. A thorough behavioural assessment will typically include:

A full health screen. Pain is one of the most underestimated drivers of aggression in dogs. Conditions affecting the spine, hips or ears can make a dog hyperreactive to sudden stimuli — including the sound of the letterbox. According to the Royal College of Veterinary Surgeons (RCVS), any dog displaying sudden or escalating aggression should have a physical health check before behavioural intervention begins.

A trigger mapping session. Your vet or a referred clinical animal behaviourist will help you identify exactly what triggers the behaviour and at what distance or intensity the dog begins to react. This "threshold mapping" is the foundation of a successful desensitisation programme.

A structured desensitisation and counter-conditioning plan. This involves gradually exposing your dog to delivery-related stimuli (the sound of footsteps, the gate clicking, the letterbox flap) at intensities too low to trigger a reaction, while pairing each exposure with a high-value reward. Done correctly and consistently, this process typically shows measurable improvement within four to eight weeks.

Pharmacological support if needed. In cases of severe anxiety, a vet may recommend a short-term course of anti-anxiety medication alongside the behavioural programme. This is not a long-term fix but can lower baseline anxiety enough to make learning possible.

Practical steps you can take today

While you arrange a vet appointment, there are immediate measures that reduce risk for delivery workers without punishing your dog:

1. Manage the environment. Use a stair gate or a room separation to ensure your dog cannot access the front door area during delivery hours.
2. Cover the glass panel of your front door or lower windows to reduce visual trigger exposure.
3. Use a basket or letterbox cage to catch post quietly rather than allowing the letterbox flap to slam — a key acoustic trigger for many dogs.
4. Order Royal Mail's free materials. You can request yellow dot stickers and "I have a dog" postcards directly from your local delivery office to alert staff before they approach.
5. Avoid scolding during or after the event. Punishing your dog after it has barked at the postman creates confusion and can increase anxiety, making the behaviour worse.

A note for landlords and families with children

Dog attacks on delivery workers are not just a welfare issue for animals — they carry legal consequences. Under the Dangerous Dogs Act 1991 and the Dogs Act 1871, owners can face criminal prosecution, a civil claim for damages, or a court order to have the dog destroyed if it injures a person, even on private property. Having a vet's assessment and a documented behavioural management plan on record can be important evidence in your defence if an incident does occur.

If your dog has shown persistent aggressive behaviour toward delivery workers, consult a vet or a qualified animal behaviourist now — before a complaint is made. Expert Zoom connects you with experienced animal health professionals who can assess your dog's behaviour and provide a personalised plan to keep both your pet and your postal worker safe.