Why Does My Dog Bark at Some Dogs but Ignore Others? DogSense UK #9
- Jul 16
- 9 min read
Your dog calmly walks past several dogs without a problem.
Then another dog appears and suddenly your usually sensible companion is staring, barking, pulling or lunging at the end of the lead.
Why that particular dog?
It can seem completely random, but dogs rarely react without a reason. The response may be connected to fear, frustration, excitement, previous experiences, body language, genetics, distance, the environment or physical discomfort.
Barking does not automatically mean your dog is aggressive or wants to fight. It often means:
“I am struggling with this situation and need more space or guidance.”
🐾 Is My Dog Being Aggressive?
Barking, growling and lunging can certainly look aggressive, but the visible behaviour does not tell us exactly how the dog feels.
A reactive dog shows an unusually strong response to something in the environment. The reaction may involve barking, lunging, pulling, spinning, freezing, trying to escape or becoming unable to respond to the owner.
Reactive behaviour is commonly driven by worry, frustration, excitement or an inability to move away from the trigger.
Your dog may be communicating:
“Please stay away from me.”
“I desperately want to approach.”
“I feel trapped on this lead.”
“That dog reminds me of something unpleasant.”
“I have already had too much to cope with today.”
Understanding the emotion behind the behaviour is far more useful than labelling the dog as dominant, aggressive or badly behaved.
❓ Why Does My Dog React to Certain Dogs?
1. Fear and the Need for More Space
Fear is one of the most common reasons dogs bark or lunge towards other dogs.
Your dog may feel threatened by the other dog’s:
Size
Speed
Posture
Direct stare
Bark
Sudden movement
Close approach
The reaction may be an attempt to increase distance.
When the other dog eventually passes or moves away, your dog experiences relief and greater safety. That relief can reinforce the behaviour.
Your dog may learn:
“When I bark or lunge, the worrying dog goes away and I feel safer.”
It is not necessarily the barking itself that feels rewarding. The important consequence is often the distance and relief that follow it.
2. Frustration and Overexcitement
Not every barking dog wants the other dog to disappear.
Some dogs react because they desperately want to approach, investigate or play but the lead prevents them from doing so. This is known as frustration-related barking.
These dogs may:
Pull forwards
Bounce repeatedly
Whine or squeal
Wag their whole body
Bark loudly
Ignore familiar commands
Become increasingly excited as the dog approaches
The intention may be friendly, but rushing towards another dog is not always welcome or safe.
Excitement still needs to be managed, and your dog does not need to greet every dog it sees.
3. The Other Dog’s Body Language
Dogs constantly communicate through movement, posture, facial expression and distance.
Your dog may ignore a relaxed dog but react to one that:
Stares directly
Freezes
Stiffens its body
Holds its tail high and rigid
Walks straight towards them
Leans forwards
Barks first
Rushes into their space
Humans may miss these subtle signals, but the dogs involved often notice them immediately.
Signs of stress or fear can include lip licking, excessive panting, hiding, cowering, tension or aggressive-looking behaviour. Sudden changes in behaviour can also be associated with illness or injury.
4. Previous Experiences
Dogs learn through association.
A frightening encounter with one dog may make your dog more cautious around others with a similar:
Size or outline
Coat colour
Movement style
Bark
Energy level
Method of approaching
This does not necessarily mean your dog dislikes an entire breed.
The dog may simply have connected certain characteristics with an unpleasant experience. Sometimes the original event was obvious, such as an attack. In other cases, it may have been a smaller encounter that the owner barely noticed.
5. Different Social Styles
Dogs have individual personalities and preferences.
Some enjoy energetic, physical play. Others prefer calm greetings and plenty of personal space.
An older dog may find a bouncing adolescent exhausting. A shy dog may struggle with a very confident dog that approaches directly. Two friendly dogs can still have completely incompatible social styles.
Dogs do not have to become friends with every dog they meet.
For many dogs, the most helpful goal is calm neutrality, not constant social interaction.
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🧬 Genetics and Individual Temperament
Some dogs are naturally more sensitive, excitable, cautious or easily aroused than others.
Genetics, breed ancestry and individual working lines can influence traits such as fearfulness, activity, arousal and responsiveness. However, upbringing, health, socialisation, learning history and the environment also contribute.
Research supports a complex interaction between genetics and life experiences rather than behaviour being controlled by one factor alone.
This means:
Genetics are not destiny.
Reactivity is not guaranteed by breed.
Training and management can still create meaningful improvement.
Some dogs may always require more space or support than others.
A dog with a naturally sensitive temperament may never become extremely sociable, but they can still learn safer and calmer ways to cope.
🦮 Why Is My Dog Worse on the Lead?
Dogs often behave differently on a lead because it restricts their choices.
They cannot easily:
Move away
Increase the distance
Approach in a natural curve
Pause and investigate
Avoid a face-to-face greeting
On-lead dogs are often guided directly towards one another. This can create more worry or frustration than a spacious, curved approach.
Blue Cross notes that lead restriction can make dogs react differently and that forced head-to-head greetings may increase worry or frustration.
A tightening lead may also communicate tension and physically restrict the dog at the exact moment it wants to move away.
This does not mean the dog should simply be released. Safe management, secure environments and reliable recall remain essential.
👀 Warning Signs Before the Barking Begins
Barking is often one of the later signs that a dog is becoming overwhelmed.
Earlier signals may include:
Closing the mouth suddenly
Lip licking
Yawning
Turning the head away
Pulling the ears back
Lowering the body
Trying to move away
Freezing
Staring
Raising one paw
Panting when it is not hot
Refusing treats
No longer responding to familiar cues
Learning your dog’s earliest warning sign allows you to create distance before the barking or lunging begins.
Once a dog is highly aroused, frightened or frustrated, learning becomes much harder.
🌡️ Why Does My Dog React Differently on Different Days?
A dog that coped yesterday may struggle today.
Their ability to cope can be affected by:
Poor sleep
A busy or noisy walk
Visitors at home
Several close dog encounters
Excitement before leaving the house
Hunger or tiredness
Fireworks or construction noise
Pain or illness
A stressful event earlier in the day
When several smaller stresses build up, the dog may reach its limit more quickly. This is commonly called trigger stacking.
The final dog your dog barks at may not have done anything particularly unusual. It may simply have appeared after your dog had already used up much of their ability to cope.
Keeping a brief diary of locations, distances, dog types and events earlier in the day can help reveal patterns.
🩺 Could Pain Cause Dog-to-Dog Reactivity?
Yes.
A dog experiencing pain or discomfort may feel more vulnerable and become less tolerant of another dog approaching.
Possible causes include:
Arthritis
Muscle soreness
Dental pain
Ear problems
Skin irritation
Injury
Reduced vision or hearing
Other underlying medical conditions
Arrange a veterinary check when:
The behaviour begins suddenly
An older dog becomes unusually reactive
Your dog dislikes being touched
Their movement or posture changes
They appear stiff after resting
Their normal tolerance decreases
The reaction becomes noticeably more intense
Do not assume every behavioural change is purely a training issue. The RSPCA advises seeking veterinary guidance when behaviour changes or a dog regularly shows signs of fear or stress.
🚶 What Should You Do When Another Dog Appears?
Create Distance Early
Distance is one of the most useful tools available.
You can:
Cross the road
Walk in a wide curve
Turn into another street
Step into a driveway
Move behind a parked vehicle
Calmly turn around
Allow the other dog to pass first
Moving away is not allowing your dog to “win.”
It prevents the situation from becoming so difficult that your dog can no longer think, respond or learn.
Reward Calm Observation
When your dog notices another dog at a manageable distance:
Allow them to see the dog.
Reward them before barking begins.
Encourage them to look back towards you.
Move away while they remain calm.
Finish before they become overwhelmed.
Work at a distance where your dog can still:
Take food
Move normally
Respond to their name
Turn away from the other dog
Follow a simple cue
The aim is to help your dog learn:
“I can notice another dog and still remain safe.”
Avoid Forced Greetings
Your dog does not need to greet every dog.
The phrase “Mine is friendly” does not guarantee that both dogs are comfortable.
A dog walking calmly past another dog without greeting is a successful outcome.
Allowing an off-lead dog to rush towards a restrained dog can create fear, frustration or defensive behaviour. Lead restriction itself can change how dogs respond to an encounter.
🌱 Helping Your Dog Become Calmer
A behaviour plan may combine management, desensitisation and counter-conditioning.
Desensitisation
The dog is exposed to the trigger at a low enough intensity or sufficient distance that they can remain calm.
The distance is reduced gradually only when the dog is coping comfortably.
Counter-Conditioning
The presence of the other dog is paired with something positive, such as food, praise or moving safely away.
Over time, the emotional response may begin to change from:
“That dog is a problem.”
to:
“Seeing a dog predicts safety and something positive.”
Progress may also involve:
Choosing quieter routes
Walking at less busy times
Teaching a calm U-turn
Rewarding voluntary attention
Practising disengagement
Avoiding unnecessary greetings
Providing adequate sleep and enrichment
Preventing repeated uncontrolled reactions
Improvement does not necessarily mean your dog will eventually want to play with every dog.
A realistic and valuable goal is:
Your dog can notice another dog, remain under control and continue walking without becoming overwhelmed.
🚫 What Should You Avoid?
Avoid:
Shouting or repeatedly saying “no”
Jerking the lead
Punishing growling
Forcing your dog to sit close to another dog
Walking directly towards the trigger
Allowing dogs to “sort it out”
Deliberately overwhelming your dog
Using tools designed to shock, hurt or frighten
Encouraging confrontation
Punishment may suppress warning signals without changing the fear or frustration underneath.
Telling a worried dog off can increase stress, and punishing growling may remove an important warning without making the dog feel safer.
🧑⚕️ When Should You Seek Professional Support?
A qualified reward-based trainer may help with mild excitement, lead pulling or early-stage barking.
For more serious cases, contact your veterinary surgeon and seek support from a qualified behaviourist, particularly when your dog:
Has bitten or attempted to bite
Redirects onto the owner or lead
Lunges powerfully
Reacts from a considerable distance
Cannot recover after the dog has passed
Is becoming increasingly difficult to control
Has shown sudden behavioural changes
Causes you to fear losing control
In the UK, the Animal Behaviour and Training Council directory can be used to find registered practitioners. Clinical Animal Behaviourists work with problematic or potentially dangerous behaviour, normally following veterinary referral.
The IAABC also provides an international directory that can be filtered for certified dog behaviour consultants available in the United Kingdom.
A suitable professional should use a plan based on:
Safety
Distance
Careful assessment
Gradual exposure
Desensitisation
Counter-conditioning
Reward-based learning
Ongoing management
Avoid anyone who deliberately provokes reactions, guarantees a quick cure or relies mainly on fear, pain or intimidation.
❤️ Final Thoughts
So, why does your dog bark at some dogs but ignore others?
The answer may involve:
The other dog’s movement or posture
Fear or frustration
Previous experiences
Lead restriction
Genetics and individual temperament
Accumulated stress
The distance between the dogs
Pain or physical discomfort
The response is rarely as simple as:
“My dog just dislikes that breed.”
Look at the full situation:
How close was the other dog?
Was the lead tight?
Did the other dog stare or approach directly?
Had your dog already experienced a stressful day?
Could your dog move away?
What happened immediately before the barking?
Your dog is not trying to embarrass you or ruin the walk.
They are communicating that the situation has become difficult.
By recognising the early signs, creating enough space and rewarding calmer choices, you can help your dog feel safer and make walks more manageable for everyone. 🐾
This article is provided for general information. Sudden behavioural changes should be discussed with your veterinary surgeon. Dogs displaying serious reactivity or aggression should be assessed by an appropriately qualified behaviour professional.
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