Why Is My Dog Reactive to Other Dogs or People?

What Is Dog Reactivity?

Dog reactivity usually describes an unusually strong response to something in the environment.

A reactive dog may:

• bark
• lunge
• pull strongly
• whine
• growl
• freeze
• stare intensely
• spin around
• jump
• become difficult to redirect

Common triggers include:

• other dogs
• unfamiliar people
• bicycles
• runners
• cars
• skateboards
• children
• visitors
• wildlife
• sudden sounds

The behaviour can happen on walks, through windows, behind fences or in other situations where the dog notices something they find exciting, worrying or frustrating.

Reactivity Is Not Always Aggression

A reactive dog may look aggressive because barking and lunging can be intense.

However, the underlying reason can be very different.

For example, one dog may lunge because they are frightened and want another dog to move away.

Another may pull and bark because they desperately want to greet the dog.

A third may react because they are frustrated by being restrained on a lead.

This distinction matters because the most appropriate training approach depends on why the reaction is happening.

Look at the Behaviour Before the Barking Starts

The reaction itself is only part of the picture.

Try to notice what your dog does immediately before barking or lunging.

Possible early signs include:

• staring
• closing the mouth
• stiffening the body
• leaning forward
• slowing down
• moving behind you
• ears changing position
• tail becoming higher or lower
• stopping sniffing
• ignoring food
• becoming unable to respond to their name

These early signs can help you recognise when your dog is approaching their limit.

Distance Matters

Many reactive dogs can cope with a trigger at one distance but not another.

For example, your dog may be able to watch another dog calmly from across a large park but bark and lunge if that dog comes within a few metres.

This distance is sometimes described as the point where the dog is still able to notice the trigger without becoming overwhelmed.

At a suitable distance, your dog may still be able to:

• take food
• respond to you
• move away
• sniff
• look at the trigger and then disengage
• continue walking

Once the trigger is too close, learning becomes much more difficult.

Creating distance is therefore one of the most useful tools when working with reactivity.

Fear Can Cause Reactivity

Some reactive dogs are trying to increase distance from something they find uncomfortable.

They may bark or lunge because the behaviour has successfully caused people or dogs to move away in the past.

Possible signs of fear may include:

• backing away
• low body posture
• ears held back
• lip licking
• avoiding direct contact
• hiding behind the owner
• attempting to escape
• becoming stiff when the trigger approaches

A fearful dog should not be forced closer to a trigger in an attempt to “get them used to it.”

Frustration Can Look Similar

Some dogs react because they want to approach something but cannot.

This is particularly common on lead.

A dog may:

• pull forward
• whine
• bark
• jump
• become highly excited
• struggle to disengage

These dogs may appear friendly once they reach the other dog or person, but repeated highly excited greetings can still reinforce the pattern of pulling and barking.

Teaching calmer responses before the greeting occurs can help.

Overexcitement Can Reduce Self-Control

Some dogs become highly stimulated by busy environments.

A walk involving several dogs, cyclists, cars and unfamiliar people may simply be too much for them to process calmly.

You may notice that reactions become more intense as the walk continues.

This can happen because arousal builds over time.

Choosing quieter environments or shorter walks may make training easier while your dog is learning.

Lead Reactivity

Some dogs react much more strongly when on lead than when they have more freedom of movement.

The lead can limit the dog's ability to:

• move away
• approach naturally
• create distance
• use normal curved approaches
• explore the environment freely

Lead tension can also increase arousal.

This does not mean dogs should simply be allowed off lead around triggers. Instead, it means the restricted movement created by the lead may be part of the context.

Window and Fence Reactivity

Dogs may also become reactive at home.

Common situations include:

• barking through windows
• running along fences
• reacting to neighbours
• barking at delivery drivers
• reacting to dogs walking past

These behaviours can become highly repetitive because the trigger eventually moves away.

From the dog's perspective, barking may appear to have successfully caused the person or dog to leave.

Reducing access to repeated trigger situations can therefore be an important part of management.

Avoid Repeatedly Putting Your Dog Over Their Limit

It is difficult for a dog to learn while they are already barking, lunging and unable to respond.

Repeated intense reactions can also strengthen the behaviour pattern.

Where practical, try to prevent unnecessary exposure to situations your dog cannot yet manage.

This may involve:

• crossing the road
• turning around
• walking at quieter times
• using parked cars as visual barriers
• choosing wider paths
• avoiding narrow entrances
• keeping more distance from triggers

These are useful management strategies, not signs of failed training.

Teach Your Dog to Disengage

One useful skill for reactive dogs is learning that they do not need to remain focused on every trigger.

You can reinforce behaviours such as:

• looking back at you
• turning away
• moving with you
• sniffing the ground
• changing direction calmly
• maintaining a loose lead

The goal is not to force the dog to ignore the environment.

It is to help them notice a trigger and then recover without escalating.

Keep Sessions Short and Successful

Training around triggers can be tiring.

A few calm exposures at a manageable distance can be more productive than a long walk filled with repeated reactions.

Watch for signs that your dog is becoming increasingly aroused.

If reactions are becoming more frequent or intense during the session, it may be time to move somewhere quieter or finish the training session.

Do Not Force Greetings

A reactive dog does not need to greet every dog or person they encounter.

Forced greetings can increase pressure and may cause the dog to feel trapped.

It is completely acceptable to:

• cross the street
• decline greetings
• move away
• ask people not to approach
• choose quieter areas

Creating space helps your dog practise calmer behaviour.

Keep a Trigger Diary

Tracking reactions can make patterns much easier to recognise.

Record:

• what your dog reacted to
• how far away the trigger was
• where the reaction happened
• what your dog did first
• whether your dog could take food
• how long recovery took
• whether multiple triggers had already occurred
• what helped your dog calm down

This information can help you identify both improvement and situations that remain difficult.