A man sitting on the floor wearing a navy polo shirt and olive green pants, holding a brown and white spaniel puppy against a plain light gray background.

Aggression in Dogs

Aggression is a communication system, and almost always a symptom of something deeper: fear, stress, uncertainty, pain, frustration or an inability to cope with a situation. It is not a sign that you are a bad owner.

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Aggression at a glance

Aggressive behaviour

Almost all aggression has a pattern. Once you learn to identify it, you can interrupt it, manage it safely and guide your dog toward calmer behaviour.

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What it usually sits on top of

Fear, stress, pain or frustration

How common

Far more common than most owners realise

Where it shows up in the home

At doors, when visitors arrive, or when people invade the dog's space

The hidden cause worth ruling out

Pain. Dogs hide it well, and constant pain makes them cranky

Realistic timeframe

Weeks of structured, consistent work rather than a single session

Where aggression shows up

  • A small black and tan dachshund wearing a light pink harness, sitting on a speckled cream floor in an indoor setting with a person's legs visible in the background.

    Towards people in the home

    Some dogs take on the job of managing who comes and goes, and inside the home they can start to feel responsible for the front door. Aggression can occur at doors, when visitors arrive, or when people invade the dog's space.

  • Towards people outside the home

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  • Between dogs in the house

    {"type"=>"root", "children"=>[{"type"=>"paragraph", "children"=>[{"type"=>"text", "value"=>"The most common cause is a dispute over who is leading the house, often triggered by favouritism or a change in household dynamic. Many dogs are naturally deferential and you may simply have missed the shift."}]}]}

The recovery framework

Introduce the section here.

Four things that undo progress

It is easy to feel stuck between ignore the behaviour, dominate the dog, or give them treats, none of which truly solve the underlying emotional state.

  • Comforting mid reaction

    Soft voice, reassurance, a hand on the collar. It can read to your dog as confirmation that the reaction was the right call.

  • Forcing exposure

    On the theory they need to get used to it. This usually makes things worse. Decrease distance to a trigger only while your dog stays calm.

  • Household inconsistency

    Different rules from different people leaves your dog with no clear picture of what is expected. Everyone in the home applies the same rules, no exceptions.

  • A man crouching in a studio while holding a Dalmatian puppy. The man is wearing a dark navy polo shirt and blue jeans, and the puppy is white with black spots.

    Telling off the growl

    Never tell your dog off for the growl or the snap itself. That suppresses the warning without touching the fear underneath it, and a dog that learns growling gets it into trouble skips the warning next time and goes straight to a bite.

Progress, not perfection

Progress is possible. Most dogs improve dramatically with the right combination of structure, emotional support, safe distance, calm leadership and consistency.

Real change takes structured, consistent work across weeks, rather than a single session or a weekend of effort. It varies by dog and history, and most owners notice a change in how their dog handles known triggers within a few weeks of consistent management. A dog with a longer history of practising the behaviour typically takes longer than one caught early.

You are not expected to handle this alone.

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Introduce the section here.

Does growling always mean my dog is aggressive?

No. Growling is your dog communicating discomfort before anything more serious happens. Telling off a growl does not remove the discomfort. It teaches your dog to skip the warning instead.

Can mild aggression improve without professional help?

Often, yes, if the triggers are identified early and managed consistently. Resource guarding and territorial behaviour at the door tend to respond well to the steps in this guide. Fear based reactivity on walks and anything involving a bite history usually needs in person support.

How long does it take to see a difference?

It varies by dog and history, and most owners notice a change in how their dog handles known triggers within a few weeks of consistent management. A dog with a longer history of practising the behaviour typically takes longer than one caught early.

My dog growls when someone sits next to me on the couch. Is that aggression?

It is guarding a resource, and in this case the resource is you. Treat it like the couch rule. Up only when invited, and a calm immediate removal for guarding.

He is fine until someone gets close to me, then he stiffens and stares. What is happening?

That is the early warning stage before a growl or a bark. Step in at the stiffening rather than waiting for the noise, because by the time it is audible your dog has already made the decision.

Is he protecting me because he loves me?

It feels like love and it is stress. Your dog has taken on a job that is too big for them and cannot put it down. Taking that job away from him is the kindest thing you can do.

How much does it cost?

There are four levels and the current prices are all on the puppy school booking page, along with exactly what each one includes.

The four weeks of class are identical at every level. What you are choosing between is how much one to one time you get in your own home, how long you keep the online course, and how directly you can reach us afterwards. Most families land on the second level, which is where a session at home and the full course access switch on.

Do you come to my home, and how far do you go?

Yes. On Puppy School, home sessions start at Silver. On Private Puppy Training and Adult Dog Training and Behaviourism, every session is at your address. A trainer comes to you and works on your setup, your routine and the behaviour that is actually happening where you live, which is almost never the same as what happens in a training room.

We cover Sydney within roughly a forty five minute drive of the Harbour Bridge. That takes in the eastern suburbs, inner west, lower and upper north shore, northern beaches and south Sydney. Only the group class brings you to a venue.

Can I talk to someone before I commit to anything?

Yes, and we would rather you did. The meet and greet is fifteen minutes, free, and there is nothing to sign at the end of it.

Bring the questions you feel silly asking. Most of what people are worried about at eight weeks is completely normal and takes about ninety seconds to answer, and knowing that before you spend anything is worth more to us than a booking made by someone who is not sure.

Can I just do the four weeks of class, without the rest?

Yes. The entry level is the four weeks of class with community support and Public-level Ask Luke. It does not include the online course, and plenty of people start there.

Worth knowing what you are trading off. Class is one hour a week in a room. Everything that actually goes wrong happens at your front door, in your hallway and on your street, and that is what the session at home is for. If budget is the reason, start where you can and step up later rather than not starting.

Where we work on this

Aggression work happens in your home, where the triggers actually are. We cover Sydney within roughly a forty five minute drive of the Harbour Bridge.

  • Eastern Suburbs
  • Inner West
  • Lower North Shore
  • Upper North Shore
  • Northern Beaches
  • South Sydney
  • Sydney CBD
  • Inner South
  • St George

Related problems we work on

See also pulling and reactivity on the lead, excessive barking and separation anxiety.

For dogs thirty two weeks and older this is handled through in home behaviour training.

How we train

  • No pain, no fear, no force

    No aggression either, on every case, without exception. We do not use prong collars, e-collars or choke chains, and we will not refer you to anyone who does.

  • A dog who chooses to listen

    What you end up with is a dog who checks in with you without being asked, settles when you sit down, and comes back when you call. Not because they have been bribed into it, and not because they are worried about what happens if they do not.

  • Who runs it

    Luke Buchanan, accredited through the Dog Trainer Academy, Red Cross certified in pet first aid and AFP background checked. Every trainer who works with a client dog holds the same before their first session.

  • We work where it happens

    Behaviour shows up in your hallway, at your front door and on your street, not in a training room. That is why the sessions are at your address rather than ours.

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