Beyond the Breed: Understanding Aggression in Dogs

Aug 26

4 min read

When stories about dog attacks hit the headlines, the conversation often turns to breed. Certain dogs are labelled “dangerous,” while others are considered naturally safe or family-friendly. But canine behaviour is far more complex than appearances alone.

Recent discussions surrounding the UK’s 2024 XL Bully ban have reignited debates around aggressive dogs and public safety. Yet research continues to show that breed alone is not a reliable way to predict aggression in dogs (Duffy et al., 2008). In fact, despite breed-specific legislation existing in the UK since the 1990s, hospital admissions from dog bites have continued to rise (RSPCA, 2024).

So if breed is not the answer, what should dog owners actually look for?

Aggression Is a Behaviour, Not a Personality Trait

One of the biggest misconceptions about aggression is the idea that some dogs are simply “bad” or naturally aggressive. In reality, aggression is a behaviour with a purpose.

Behaviourists such as James O’Heare (2017) and Campbell (2016) explain that aggression is not a personality type or fixed characteristic. Like humans and other mammals, dogs may use aggressive behaviours when they feel threatened, frightened, trapped, frustrated, or unsafe. In many situations, aggression is actually designed to prevent conflict rather than cause harm.

A growl, bark, stiff posture, or lip curl is often a dog’s way of saying:

“I’m uncomfortable.”
“Please give me space.”
“I don’t feel safe right now.”

When these warnings are ignored, the dog may feel they have no other option but to escalate their behaviour.

Learning to Read the Warning Signs

Dogs communicate constantly through body posture, movement, facial expressions, and behavioural patterns. While many people refer to this as “body language,” O’Heare (2017) suggests this term can be misleading because dogs are not using language in the same way humans do. Instead, they display species-specific patterns of behaviour that help them navigate situations.

Some common warning signs associated with stress or potential aggression include:

Stiffening of the body
Raised hackles
Hard staring
Tense facial muscles
Freezing
Avoidance behaviours
Lip licking or yawning in stressful situations
Growling or snapping

These signs are often misunderstood or missed entirely.

The Ladder of Aggression

Behaviourist Kendal Shepherd’s (2012) “Ladder of Aggression” is a useful framework for understanding how dogs escalate behaviour over time. The idea is simple: dogs usually give multiple warning signals before resorting to biting.

A dog may first try subtle behaviours like:

Turning their head away
Avoiding eye contact
Walking away
Freezing

If those signals fail, the behaviour may intensify into growling, snapping, or biting.

However, real-life behaviour is not always linear. Dogs are individuals, and their reactions are shaped by past experiences, genetics, environment, learning history, and emotional state.

Some dogs may display conflicting or “ambivalent” behaviours — wanting to approach but also wanting to retreat. For example, a nervous dog may approach a person cautiously but react suddenly if they feel cornered or unable to escape. These situations can be especially risky because the dog is emotionally conflicted.

Why a Holistic Approach Matters

Understanding canine aggression requires more than simply looking at a dog’s breed or size. A truly effective assessment considers:

Early life experiences
Socialisation history
Training methods used
Health and pain
Environment
Stress levels
Emotional state
Previous traumatic experiences
Context of the behaviour

This is why modern dog training and behaviour work focuses on understanding why the behaviour is happening rather than simply punishing the behaviour itself.

Instead of asking: “What is this dog trying to do?”

A better question is: “What is this dog trying to achieve?”

That shift in perspective changes everything.

Supporting Dogs, Supporting Owners

Aggressive behaviour can feel frightening and overwhelming for owners, but it does not mean a dog is beyond help. In many cases, behaviours improve significantly when owners learn to recognise stress signals early, manage environments appropriately, and use ethical, evidence-based training methods.

The earlier warning signs are recognised, the better the outcome tends to be — both for the dog and the people around them.

Final Thoughts

Canine aggression is not black and white. It is rarely about dominance or breed alone. It is about context, emotion, communication, and function.

By moving away from stereotypes and focusing instead on understanding the individual dog in front of us, we create safer outcomes, stronger relationships, and better welfare for dogs and their owners alike.

Because behind every behaviour, there is a reason — and understanding that reason is the first step toward meaningful change.

references

Campbell, E.J., 2016. Owners’ abilities to recognise and comprehend signs or displays of aggression in their canine companions out with the home environment. Veterinary Nursing Journal, 31(11), pp.329-333.

Duffy, D.L., Hsu, Y. and Serpell, J.A., 2008. Breed differences in canine aggression. Applied Animal Behaviour Science, 114(3-4), pp.441-460.

O'Heare, J., 2017. Aggressive behavior in dogs: A comprehensive technical manual for professionals. Dogwise Publishing.

RSPCA, 2024. End laws marking dogs as dangerous by how they look. Available at: https://www.rspca.org.uk/getinvolved/campaign/bsl#:~:text=As%20suspected%2C%20the%20XL%20bully,owners%20prepare%20for%20the%20ban (Accessed: 29/01/2025).

Shepherd, K., 2012. Keeping ourselves safe near dogs. Available at: https://static1.squarespace.com/static/55759105e4b0156262b76f6f/t/579d1cf69de4bb7ff3132cc2/1469914399724/EDU+ASAB+dogs+teacher+notes.pdf (Accessed: 29/01/2025).