My dog is showing aggressive behaviour

First: manage the risk

• Avoid known triggers while you arrange assessment. Do not repeat a situation to test your dog.
• Use secure doors, gates, leads and suitable barriers. Do not allow off-lead access where control is uncertain.
• Separate safely from children, visitors or animals if there is a risk. Give your dog a quiet retreat.
• Walk at quieter times or places, leaving enough distance for your dog to cope.
• Keep a brief note of what happened before and after each episode; do not provoke behaviour to film it.

Management protects everyone while treatment is planned. It is not punishment. Do not punish growling, force greetings or use intimidation, “alpha” handling, physical corrections or aversive devices.

Body language, recall and nervous dogs · If an attack is happening.

Arrange a veterinary assessment

Call your vet, especially if aggression starts suddenly, changes significantly, worsens or occurs with pain or illness. Pain, sensory decline, neurological illness and other medical conditions can affect behaviour; a single incident does not identify the cause.

Tell the practice about bite risk before arriving so it can plan safe handling. Do not stop prescribed medication yourself. Severe pain, collapse or other urgent symptoms need emergency help.

Find qualified, evidence-based behaviour support

Ask your vet for a referral. In the UK, a veterinary behaviourist is a vet with behaviour expertise; a clinical animal behaviourist assesses and treats behaviour problems, working with your vet. A trainer can help teach skills, but complex aggression needs the right assessment.

Titles alone do not establish qualifications. Check recognised accreditation, insurance and methods. The Animal Behaviour and Training Council explains practitioner roles and registers. Outside the UK, ask your vet about the equivalent recognised standards.

Choose reward-based help. Avoid anyone promising a quick cure through fear, pain, dominance or intimidation.

A muzzle can be a responsible safety tool

A correctly fitted basket-style muzzle can allow panting, drinking and treats while reducing bite risk. Ask for help choosing the right fit for your dog. Tight fabric muzzles are unsuitable for routine walks because they limit panting.

Introduce it slowly with rewards: first reward interest, then voluntary nose placement, then very brief fastening when comfortable. Build duration gradually; do not force it on a distressed dog. Follow Dogs Trust’s muzzle-training steps.

Supervise use. A muzzle does not replace distance, secure handling or assessment, and must not be used to force an interaction the dog cannot cope with. Check any legal muzzle requirements too. Equipment guidance.

Children, visitors and the home

Children must not be expected to manage an unpredictable dog. Use physical separation where risk exists; supervision alone may not prevent a sudden bite. Plan visits in advance and keep the dog in a secure comfortable space if necessary.

Do not disturb a dog eating, sleeping or guarding an item. Avoid taking food/toys by force. Give safe retreat space and ask the behaviour professional to plan handling and resource-guarding support. Never force a child and dog to interact.

When the risk is serious

Repeated bites, escalating threats, risk to children or inability to keep people/animals safe needs urgent veterinary and behavioural advice. Tell professionals the full history. If an attack is happening, prioritise safety and emergency help.

Rehoming is not an automatic solution and can transfer risk. Severe behaviour cases may require a careful veterinary welfare and safety discussion, which can sometimes include euthanasia. This is an individual professional assessment, not a decision made from a web page. End-of-life care and support.

Evidence and review

English guidance. Reviewed 1 October 2026; Safety advice supports professional help; it does not diagnose.

• PDSA: dog aggression
• ABTC: types of behaviour practitioner
• Dogs Trust: muzzle training

Report a correction.

Safety, recovery and life together

• If a dog growls, snaps or bites a child
• Tension between dogs and what to do after a fight