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Signs you have a reactive dog

Updated 03 December 2025
Read time: 8 mins
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Written by Corinne Homer
Copywriter
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Reviewed by Charlotte Niblett
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If you’ve found your dog to be unpredictable at times - easily ‘set off’ by strangers or other dogs for example - you might have a reactive dog.

Reactivity in dogs can stem from all kinds of triggers and is somewhat common, but it can become an issue if you find it tricky to handle your dog and return them to a neutral state. 

In this article, we’ll lay out the signs of reactivity in dogs, what causes a dog to be reactive by nature, and some hints and tips to keep your dog regulated during trigger situations.

 

How do I know if my dog is reactive?

If you’re wondering if your dog is reactive, it’s likely they launch into behaviours that are suddenly excitable, fearful and impulsive whenever they come across a trigger. If you recognise any of the following signs, it may be time to look for the next steps to help your reactive pooch.

 

Signs of a reactive dog

If your dog is reactive, they may behave in the following ways when they are ‘triggered’... 

 

  • Sudden barking, growling or whining at the trigger, which alarms others around them.

  • Lunging on the lead, so you have to pull them back.

  • Freezing, staring hard at what’s triggered them. Their pupils might dilate, and their tail might be rigid and held high, or tucked tightly under their body. 

  • Hyper-focusing on the trigger. They may seem so focused they will ignore treats or your commands, when that would usually be enough to distract them. 

  • Acting differently behind a ‘barrier’. Lots of reactive dogs are more aggressive when they’re held back by a lead, or there’s a fence or gate between them and the trigger.

  • Panting, drooling or pacing when the trigger is nearby.

  • Trembling or trying to hide, if they’re fearful of the trigger.

  • Spinning, jumping, or bouncing with energy when triggered.

  • Slow to calm down. Even after the trigger is out of sight, your dog takes a while to return to normal.

 

 

What can ‘trigger’ a reactive dog?

When we reference a ‘trigger’, this can be anything your pooch feels particularly emotional around, such as next door’s cat, bigger dogs, red cars, motorbikes, squirrels, the post person, etc. 

A trigger might be very specific to your dog - like teenage boys on bicycles, for example, which stems from a stressful experience your dog once had. Or the triggers may be vague and hard to pin down. 

Your dog may seem upset by some dogs and not others, for instance, for no obvious reason. 

 

What causes a dog to be reactive?

The reasons a dog is reactive can be very broad and vary from dog to dog. 

Generally, a dog being sensitive when triggered can stem from any of the following… 

 

  • A fearful or anxious temperament. Some dogs are naturally more cautious and react strongly when they sense something unfamiliar or threatening.

  • Traumatic past experiences. A negative history of neglect or abuse, or even just a previous injury, accident or altercation with another dog, can frighten a dog in the present.

  • Lack of socialisation. Early years are really important for a dog’s development, and if they weren’t socialised as a puppy, they often won’t behave calmly as an adult dog.

  • Genetics. Some dogs are anxious and reactive by nature, either because of their breed or because their parents were.

  • Built-up frustration. A pooch who hasn’t been outside much, or hasn’t been stimulated physically or mentally, can find it hard to regulate once they are around other people and animals.

  • An overstimulating environment. A busy, hectic or noisy environment can increase reactivity in an otherwise calm dog.

  • Pain or medical issues. If your pooch is lashing out or acting with sudden emotion, it could indicate an underlying injury, sickness or medical issue.


 

How to manage a reactive dog

If your dog’s reactivity is hard to handle, there are steps you can take to manage and reduce the sudden behaviours.

Firstly, try to identify your dog’s triggers.

Observe what sets your dog off
(other dogs, people, noises, bikes), make a note of them and pre-empt your dog's reaction if you see them up ahead when on a walk.

This way, you can firstly manage distance by giving them a wide berth, crossing the street or taking another route to prevent your dog from getting worked up.

That said, eventual and gradual exposure therapy is the next step to showing your pooch they can be calm in triggering scenarios. 

Regularly teach focus and self-control with cues like ‘look at me’, ‘leave it’ and ‘sit/stay’ - starting out in low-stress situations and slowly exposing your dog to triggers at safe distances. 

Remember to stay calm yourself - adopt a calm and steady voice and stance, and avoid jerking the lead harshly, as your dog will pick up on your emotions, too.

Each time your dog responds calmly to what once triggered them, or quickly returns to neutral after an initial reaction, reward them with a healthy dog treat and lots of praise.

This will reinforce good coping skills and show your pooch there’s nothing to be afraid of.

 

Can you train a dog not to be reactive?

Training your dog to manage their emotions and stay regulated begins at home, and can be encouraged with exercise, training activities and a healthy, nutrient-dense diet for dogs.

Going for walks in new environments exposes them to new sights, smells and potential triggers, and reduces pent-up energy so they’ll be calmer in general. 

When it comes to food, keep fatty treats and human food to a minimum, and keep their meals full of nutrients and supplements so they feel calm and rested from the inside out.

 

Can a dog’s diet affect their reactivity?

Yes, a wholesome diet for dogs full of fresh, natural ingredients can really help a dog to stay calm and regulated, as the gut and brain is intrinsically linked through the gut-brain axis.

High-quality proteins and amino acids like L-tryptophan (found in Turkey and in our Calm & Relaxed Wet and Dry food) can help boost feel-good brain chemicals, omega-3s found in oily fish can ease stress, and fibre-rich foods keep their gut and mood in check.

 

 

Steering clear of artificial additives and nasties can help reduce hyperactivity, so your pooch will feel more relaxed and focused throughout the day, therefore less reactive when out and about.

 

When to seek help from a vet 

If you’ve tried everything to calm your dog and reduce their reactive tendencies, but they still go crazy now and then, it’s completely normal to seek professional help. 

A pet behavioural therapist can give you a personalised training plan that homes in on your dog’s particular triggers and quirks, so eventually your pooch will move through the world with a level of relaxed confidence.

Do you have any experiences with reactive dogs? Let us know in the comments what helped you and your pooch.

 

FAQs

What is the most reactive dog breed?

There isn’t really a specific breed that shows more reactivity than others; a dog’s level of reactivity will be mostly due to their past experiences, temperament and level of socialisation as a puppy. 

However, some breeds are more protective of their owners than others due to being working dogs, herding dogs or guard dogs. 

Whereas small dog breeds can be perceived as more reactive due to everything seeming large and threatening to their small stature. This doesn’t have a significant sway factor, though, as all dog breeds have the potential to be reactive.

 

What are ‘red flag’ dog behaviours?

If your pooch is totally ignoring your cues, constantly lunging on the lead or freezing at triggers, these are signs your pooch finds it hard to regulate themselves and could do with some help reducing their reactivity.

 

At what age are dogs most reactive?

Reactivity can show up at any age, but it often becomes noticeable when your dog is an adolescent or young adult dog, when confidence and social skills are still developing. 

This is why training and socialising dogs in their early years is so integral, so they grow to become more regulated as they mature.

 

Is it the owner’s fault if a dog is reactive?

No - the owner is likely trying their best to control their pooch each time they’re reactive.

Reactivity usually comes from a mix of temperament, past experiences, environment and genetics, and the owner is rarely to blame.

 

Give your reactive dog a foundation of calmness with a nutritious grain-free dog food full of whole proteins, tasty vegetables and supplements - or try our calming treats for dogs with Turkey and Hemp, for natural relaxation.

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