Harnesses for Reactive Dogs! What is Best!
Clients often begin their packages with us desperately trying to restrain their reactive dog on a harness.
And I do understand why – hearing your dog choke themselves on a collar is unpleasant, worrying, and makes you feel like you’re hurting them. So naturally, many owners move to a harness because it feels safer, kinder and more comfortable.
In many situations, that can be true.
A well-fitted harness can reduce pressure on the neck, and for dogs with certain medical issues — for example tracheal problems, neck pain, some eye conditions, or flat-faced breeds, a harness may be the more appropriate choice.
Veterinary sources also note that hard pulling on a collar can place pressure on delicate neck structures, so this isn’t something we dismiss lightly.
However, whilst we rarely make generalisations in dog training (because dogs, owners and situations are all different) we can say this:
We rarely use harnesses as the main tool when we’re training a dog out of reactivity, lunging and heavy lead pulling.
Not because harnesses are ‘bad’ – because they’re often the wrong tool for that particular job.
Harnesses do not teach dogs to pull
Let’s clear this up straight away.
It is not true that harnesses automatically teach dogs to pull.
Plenty of dogs walk beautifully on a harness. Plenty of calm, well-trained dogs can wear a harness and still offer loose lead walking, engagement and neutrality around distractions.
The problem is not the harness itself – the problem is what a harness allows the dog to do safely, which is to allow safe pulling.
Think Canicross, bikejoring, scentwork, tracking, bitework, hiking, long-line exploration and other activities where we actively want the dog to move forward with freedom & often with power.
In those contexts, the harness makes sense – the dog can lean into it. the force is spread across the body, the neck is protected and he dog can drive forward with confidence.
But the above reasons are also why they can be unhelpful when we’re dealing with a reactive dog that already wants to launch, drag, lunge, brace or pull towards triggers.
Why harnesses can make reactivity work harder
When a dog reacts, they are usually trying to create distance, access something, control space, or respond to a trigger they find overwhelming, exciting or threatening.
That trigger might be another dog.
- A person.
- A bike.
- A runner.
- Traffic.
- A child.
- A cat.
- A doorway.
- A narrow path.
- A dog appearing at the end of the street.
In that moment, the dog is not calmly exhibiting their loose lead walking – they are emotionally loaded. They surge forward, hit the end of the lead and pull.
If that dog is wearing a back-clip harness, they often have the mechanical ability to put more of their bodyweight into the lead. Research comparing neck collars and back-connection harnesses found that dogs pulled harder and more steadily on a back-connected harness when trying to reach food, although not in every test condition.
That doesn’t mean a harness caused the behaviour – it means the harness may make the behaviour easier to rehearse.
This is relevant because every time a reactive dog practises lunging, dragging and exploding at the end of the lead, they are improving & rehearsing that pattern.
Reactivity training is not just about restraint
This is the big thing owners often miss.
If your dog is reactive, the goal is not simply to hold them back more effectively.
The goal is to change how they feel, think and behave around their triggers.
That means we need to work on distance, timing, engagement, lead handling, reinforcement, movement, recovery and controlled exposure.
In behavioural terms, this is where desensitisation and counter-conditioning come in.
Desensitisation means exposing the dog to the trigger at a low enough intensity that they can cope, and counter-conditioning means pairing that trigger with something that helps create a better emotional response.
In normal language:
We show the dog the world in a way they can handle, and we teach them a better response before they kick off.
That is very different from just buying stronger equipment.
Equipment can help you manage the dog – it cannot do the training for you.
So why do we often prefer a collar?
For loose lead walking and reactivity work, we usually prefer to teach the dog through some form of appropriate collar setup, alongside structured desensitisation to triggers.
When we use a collar properly, we are looking for clearer communication, cleaner lead handling and less opportunity for the dog to load their whole body into the equipment.
The collar is not the solution – it is one part of a wider training system. The actual solution is teaching the dog to understand pressure, follow guidance, disengage from triggers, regulate themselves and move through the environment without exploding.
But aren’t collars risky too?
They can be.
This is why this topic needs nuance.
A dog that is constantly slamming into the end of a collar is not in a good training setup. Pulling into a collar can apply too much pressure to the neck, and a 2025 review of walking equipment concluded that there is no single restraint device that can be universally recommended for every dog.
So the answer is not ‘collars good, harnesses bad’. The answer is:
Choose the tool that gives you the safest, clearest and most effective route to changing the behaviour.
For some dogs, especially those with medical concerns, that may involve a harness. For the majority of others, especially strong reactive dogs that have learned to drive forward into a harness, we will see better results by moving to a properly fitted collar and teaching the dog how to respond to it.
The key is that the tool must fit the dog, the owner and the training goal.
When we might use a harness
We are not anti-harness.
We may use a harness for puppies during early development, so they can safely explore the world without hurting themselves or creating conflict around future collar work.
We may use a harness for long-line work, decompression walks, tracking, scentwork, sport, or situations where the dog needs freedom of movement without pressure on the neck.
We may also use a harness where there are undeniable medical reasons to avoid neck pressure.
A good harness can absolutely have a place – it’s just not be the best primary tool for fixing reactivity, lunging or serious pulling.
When we probably would not use a harness
If a dog is already launching at triggers, dragging the owner down the street, spinning, barking, bracing and pulling with their full bodyweight, a harness often gives them too much opportunity to rehearse the very behaviour we are trying to reduce.
A reactive dog on a harness can often plant their chest, drop their weight and drive forward like they’re in a pulling sport.
That’s useful if you’re doing Canicross.
Less useful if you’re trying to walk past a Labrador outside Tesco without your shoulder leaving its socket.
The real question owners should ask
Most owners ask ‘should I use a harness or a collar?’
A better question is:
“What behaviour is this equipment helping my dog practise?”
If the answer is calm walking, engagement and decompression, great.
If the answer is dragging, lunging and scanning the environment for the next explosion, then the equipment needs changing, not necessarily because the tool is cruel, but because it is helping the wrong pattern repeat.
Our approach
For reactivity and loose lead walking, we usually focus on:
Teaching the dog how to move with the handler.
Teaching them how to respond to lead pressure without panic or opposition.
Building engagement around distractions.
Using distance properly.
Reducing rehearsal of lunging and pulling.
Changing the dog’s emotional response to triggers.
Giving the owner enough control to stay calm and consistent.
That last point matters – a reactive dog does not need an owner who is constantly bracing, panicking, apologising and being dragged into every situation. They need an owner who can calmly guide them.
The right equipment will help that happen.
Final thoughts
Harnesses are not bad.
Collars are not magic.
And no piece of equipment fixes reactivity by itself.
But if your reactive dog is launching into a harness every day, dragging you towards triggers and rehearsing the same behaviour over and over again, it may not be the most useful tool for the job.
For puppies, exploration, sport, long-line work and certain medical needs, harnesses can be excellent.
For loose lead walking and reactivity training, we often prefer an appropriate collar, used carefully, alongside structured training and desensitisation.
The goal is not to restrain the dog forever – the goal is to teach them how to cope, which starts with choosing equipment that supports the behaviour we actually want.
Is a harness bad for a reactive dog?
No. A harness is not automatically bad for a reactive dog. The issue is that some harnesses, especially back-clip harnesses, can make it easier for a dog to put their full bodyweight into pulling and lunging. If the dog is rehearsing reactivity in the harness, it may not be the best training tool.
Does a harness make dogs pull more?
A harness does not teach every dog to pull. Many dogs walk calmly on harnesses once trained. However, research has found that dogs may pull harder and more steadily on a back-connected harness in some situations, so it depends on the dog, the harness and the context.
Should I use a collar or harness for loose lead walking?
It depends on the dog. For a few dogs, a harness is safer or more appropriate. For the majority of others, especially dogs that have learned to drag into a harness, a properly fitted collar will give clearer communication for loose lead walking. The training matters more than the equipment.
What is the best leash for a reactive dog?
There is no universal best leash. The right choice depends on your dog’s size, health, behaviour, strength, training history and triggers. The safest option is to work with a trainer who can assess the dog in person and choose equipment that reduces rehearsal of lunging while supporting calm behaviour.
First Published: 23/08/2023
Updated: 25/06/2026
