My Dog Attacked Another Dog: What to Do Next (And What Not to Do)

Few things are more frightening than watching your dog attack another dog. Many owners are left feeling shocked, guilty and wondering if their dog has suddenly become aggressive.

The good news is that one incident does not automatically mean your dog is dangerous. In many cases, there are underlying reasons for the behaviour, and with the right support, many dogs can learn safer ways to respond.

Step 1: Stay Calm and Get Everyone to Safety

Your first priority is to safely separate the dogs and prevent another incident. Once everyone is safe:

Check both dogs for injuries.
Exchange contact details with the other owner if required.
Secure your dog to prevent another escape.
Seek veterinary attention if either dog has been injured.

Avoid yelling, hitting or punishing your dog after the incident. Punishment can increase fear, anxiety and aggression, making future behaviour worse.

Step 2: Ask Yourself What Happened Before the Attack

Dogs rarely bite “out of nowhere.”

Think about:

Was your dog protecting their home or yard?
Were they on lead or behind a fence?
Did another dog approach too closely?
Was your dog startled?
Were there food, toys or people nearby?
Has your dog shown signs of stress or discomfort before?

Understanding what happened immediately before the incident is often the key to preventing it from happening again.

Step 3: Prevent It Happening Again

Until you understand why the behaviour occurred:

Keep gates securely closed.
Check fencing regularly.
Walk your dog on lead.
Avoid situations that may trigger another incident.
Don’t allow your dog to rehearse the behaviour.

Every successful repetition of unwanted behaviour makes it more likely to happen again.

Step 4: Have Your Dog Professionally Assessed

Not all dog aggression is the same.

Some dogs react because they are fearful.

Others become frustrated.

Some are protecting territory or resources.

Pain or underlying medical conditions can also contribute to behavioural changes.

Because every dog is different, a personalised behaviour assessment is the most effective way to identify the underlying cause and develop an appropriate training plan.

Can Dogs Improve After an Attack?

Yes—many can.

The outcome depends on factors including:

Why the behaviour occurred.
Your dog’s learning history.
Management at home.
Consistency of training.
How early intervention begins.

The goal isn’t simply to stop the behaviour. It’s to change the emotions and learning that are driving it, creating safer and more reliable behaviour over the long term.

Avoid Quick Fixes

Unfortunately, dog training is an unregulated industry. Anyone can call themselves a dog trainer, regardless of their qualifications or methods.

Be cautious of anyone promising instant results or relying on punishment, intimidation or fear.

Evidence shows that science-based, force-free training is effective for teaching new behaviours while protecting your dog’s welfare and strengthening your relationship.

When Should You Seek Help?

If your dog has:

Attacked another dog.
Tried to attack another dog.
Growled, lunged or snapped.
Become increasingly reactive on walks.
Escaped your property to chase other dogs.

It’s worth seeking professional advice sooner rather than later. Early intervention often leads to better outcomes.