Types of Reactivity in Dogs
- canineconnectionst1
- May 19
- 7 min read
Does your dog bark, lunge, pull or completely lose focus around other dogs, people or certain situations?
Reactive behaviour in dogs is one of the most common struggles owners face — and one of the most misunderstood.
Many owners are told their dog is:
"Aggressive"
"Dominant"
"Protective"
"Just excited"
But reactivity is far more complex than that.
In reality, reactive behaviour is often driven by underlying emotions such as fear, frustration, over-arousal or learned associations. Two dogs may display the exact same behaviour on the outside - barking and lunging on walks, for example - while experiencing completely different emotions internally.
Understanding why your dog is reacting is one of the most important steps in improving their behaviour.
At Canine Connections Teesside, we work with reactive dogs across Middlesbrough, Teesside and North Yorkshire, helping owners better understand their dogs and build calmer, more manageable behaviour through structured training and behaviour support.
In this guide, we'll explain:
The main types of reactivity in dogs
What causes reactive behaviour
How different emotions influence reactions
Why identifying the root cause matters
How professional support can help
What is Reactivity In Dogs?
Reactivity describes an exaggerated emotional or behavioural response to a trigger.
This often includes:
Barking
Lunging
Growling
Pulling on the lead
Whining
Fixating
Jumping
Hyper-focus around triggers
Not just the odd bark at the door if someone knocks, reactivity is a behaviour which is over-exaggerated for the situation or environment the dog is in.
Triggers may include:
Other dogs
People
Vehicles
Visitors
Noises
Movement
Lead restriction
Busy environments
Reactive behaviour itself is not a diagnosis - it is simply the outward expression of an emotional response.
Understanding the type of reactivity your dog is displaying is so important.
The Different Types of Reactivity in Dogs
There are several common types of reactivity we regularly see in dogs. However, behaviour is rarely black and white.
Many dogs display elements of multiple types of reactivity depending on:
Environment
Stress levels
Genetics
Learning history
Previous experiences
Lead handling
Arousal levels
This is not about placing labels on dogs - it’s about understanding where your dog may need the most support.
Fear Based Reactivity
Fear-based reactivity is one of the most common forms of reactivity in dogs that we see.
These dogs react because they feel unsafe, overwhelmed or worried about a trigger.
Reactive behaviour is designed to create distance between the dog and the trigger.
Common signs could include:
Barking to make the triggers go away
Lunging defensively
Avoidance behaviours
Growling
Tension around unfamiliar dogs or people
Startling easily
Retreating after reacting
Looking to their owner for reassurance
Fear-reactive dogs are often misunderstood as “aggressive”, when in reality they may be
deeply uncomfortable or anxious.
Common causes may include:
Lack of positive exposure during development
Genetic sensitivity
Pain or discomfort
Previous traumatic experiences
Forcing fearful dogs into overwhelming situations often makes behaviours worse. The last thing we want to do is push a fearful dog into an unmanaged, potentially unsafe situation. Their behaviour is completely unpredictable if no current training is occurring. The outcomes of this could be fatal, and what makes this worse is that the dog is acting purely out of fear, and just trying to get away from the trigger or make the trigger go away.
Instead, as an owner you can work on:
Building confidence - with yourself and your dog
Reducing pressure
Emotional safety
If your dog reacts out of fear, early support can make a huge difference before behaviours become more deeply established.
Book a consultation to better understand your dog’s behaviour and build a calmer, more confident future together.
Frustration Based Reactivity
Frustration-based reactivity happens when a dog is prevented from accessing something they strongly want.
This is especially common around:
Other dogs
Greetings
People
Play / food opportunities
Movement
Many frustrated reactive dogs are highly social and appear “friendly” - but their inability to cope with restriction creates emotional overload.
Common signs include:
Barking when unable to greet
Pulling intensely on the lead
Whining or screaming
Fixating on dogs or people
Spinning or bouncing
Lunging out of excitement
This is commonly seen in dogs who:
Have been allowed constant on-lead greetings
Become overly dependent on social interactions
Struggle with impulse control
Have poor emotional regulation
Over time, repeated frustration can build into stronger reactive habits.
At Canine Connections Teesside we are seeing frustration-based reactivity more often every day. Understanding how boundaries and expectations can positively affect your dog as well as negatively (if they are not in place) is crucial to preventing your dog from becoming frustrated.
This is one reason why “they just want to say hello” should be managed. Advocate for your dog if you are limiting greetings, it’s fine for them to pass some dogs and not give them a big, loud “hello”! Neutrality makes for a balanced, calm and happy dog, not one who depends heavily on social interactions and struggles with impulse control.
Over-Aroused / Over-stimulated Reactivity
Some dogs become reactive because their nervous system becomes overloaded.
These dogs are often described as:
Hyper
Wild
Constantly excited
Unable to switch off
Over-arousal happens when excitement levels become so high that the dog loses the ability to think clearly or regulate emotions effectively.
Common signs include:
Zoomies
Barking excessively
Mouthiness
Inability to disengage
Pulling constantly
Jumping up
Struggling to settle after walks
Triggers may include:
Busy walks
Visitors
Play
Repetitive ball throwing
Constant stimulation
Highly exciting environments
Over-aroused dogs often struggle to stay below threshold around triggers, making reactive outbursts much more likely.
Many adolescent dogs particularly struggle with this.
Lead Conditioned Reactivity
Lead conditioned reactivity develops when the dog begins associating the lead itself with frustration, tension or stress.
Some dogs behave calmly off lead but become reactive the moment they are attached to a lead.
This often develops because:
The dog feels restricted
The lead creates frustration
Tight leads increase tension
Repeated reactions become habit
Walks become emotionally charged
Common signs include:
Reactivity only on lead
Immediate tension when triggers appear
Increased pulling
Hyper-vigilance on walks
Anticipation behaviours
Unfortunately, repeated exposure to stressful walks can strengthen these emotional patterns over time.
Pure Aggression
True aggression is actually far less common than many people believe.
When it does happen, when you know what to look for - it can be very intense.
Many reactive dogs are labelled “aggressive” when they are actually fearful, frustrated or overwhelmed. They have displayed behaviours with the purpose of communicating “Get away from me”, “I want to play! I normally can, why can’t I now?”, or as an outlet of energy.
However, genuine aggressive intent can exist in some cases and should always be taken very seriously.
Signs may include:
Intent to cause harm
Repeated attempts to bite
Lack of disengagement
Escalation without obvious emotional conflict
Guarding behaviours
Predatory behaviour patterns
Aggression can also be influenced by:
Pain
Medical conditions
Genetics
Previous learned history
Resource guarding
Stress
If your dog has shown biting behaviour or serious aggression, professional behavioural support should be sought as early as possible. Ignoring the behaviour will only cause it to become worse.
Every case we see is welcomed with no judgement at all. You are taking the first step to building a proper foundation to ensure you can predict your dogs behaviour and enjoy life with your dog!
Why Understanding your dog's reactivity matters
Two dogs can show identical reactive behaviours for completely different reasons.
For example:
One dog may bark because they are terrified
Another may bark because they are frustrated and cannot greet
The behaviour looks similar on the surface - but the emotional drivers are completely different.
Understanding the underlying emotion, and also history of the dog, allows training plans to become:
More effective
More humane
More structured
More realistic
This also helps you as an owner advocate for your dog and avoid situations that worsen emotional overload.
Can Dogs show multiple types of reactivity?
Absolutely. Actually, this is the case for most reactive dogs.
Reactivity is not linear.
Many dogs display a combination of:
Fear
Frustration
Over-arousal
Learned lead associations
For example:
A dog may initially become frustrated around other dogs, when on lead, due to always being able to greet without any restriction. However, repeated stressful experiences eventually create fear and anticipation too.
Behaviour is fluid and influenced by emotional state, environment and previous experiences.
This is why understanding the individual dog is always more important than simply applying a label.
How we Help reactive dogs in Teesside
At Canine Connections Teesside, we work with:
Fear based reactive dogs
Frustrated based reactive dogs
Over-aroused dogs
Lead-based reactive dogs
Nervous dogs
Complex behavioural cases
We help owners across:
Teesside
Middlesbrough
Redcar
Whitby
Stokesley
Great Ayton
North Yorkshire
Get in touch by Booking a Consultation
Support options include:
One-to-one training
Behaviour consultations
Structured reactivity support
Real-world exposure work
Calmness and engagement training
Every dog is different - which is why behaviour plans should always be tailored to the individual dog and owner.
frequently Asked Questions
What is the most common type of reactivity in dogs?
Fear-based and frustration-based reactivity are among the most common forms we see in pet dogs.
Is reactive behaviour the same as aggression?
No. Many dogs are not aggressive. They may simply be overwhelmed, fearful or frustrated.
Can reactive dogs improve?
Yes — with the right support, management and training, many reactive dogs can become significantly calmer and more manageable over time.
Why is my dog only reactive on the lead?
This may indicate lead-conditioned frustration, tension or anxiety associated with restraint.
Struggling with your dog's reactivity?
If your dog is barking, lunging, pulling or becoming overwhelmed on walks, you don’t have to manage it alone.
At Canine Connections Teesside, we help owners understand the why behind their dog’s behaviour through structured, professional support tailored to the individual dog.
Whether your dog struggles with:
Fear-based reactivity
Frustration around other dogs
Over-arousal
Lead reactivity
Aggressive behaviours
We can help.
Book a consultation today and start building calmer, more enjoyable walks with your dog.
Author Details
Written by Joe, qualified Dog Behaviourist & Trainer at Canine Connections Teesside, helping owners across Teesside build calmer, more confident dogs.
