Reactive Dogs: What Causes It—and What Can You Do?

Your dog goes completely crazy at the sight of a cyclist. Or he barks at every other dog as if it were a matter of life and death. Maybe he pulls wildly on the leash as soon as he sees something interesting, and you wonder: Is my dog reactive? Or just seeking stimulation?

That's a valid question—and the answer makes a big difference. 

What is a reactive dog?

Reactivity means that your dog reacts excessively to certain stimuli in its environment—that is, more intensely, more quickly, and for longer than other dogs. This can manifest as barking, growling, pulling on the leash, freezing, trembling, or losing control.

Important to know: A reactive dog is not a bad dog. Nor is it a dominant dog. It is a dog whose stress response is in overdrive—often because it feels overwhelmed, insecure, or frustrated. Reactivity is not a character flaw. It is a reaction to a world that is simply too loud, too much, or too close for the dog at that moment.

Common triggers for reactive dogs include:

• Other dogs (especially when on a leash)
• Strangers or certain groups of people (e.g., men wearing hoods, children)
• Sources of movement: bicycles, joggers, cars, scooters
• Loud noises: thunderstorms, fireworks, construction sites
• Tight spots where there is no way to get out of the way

Reactive or thrill-seeking—what's the difference?

This is where things get interesting—and this is also where a common misunderstanding arises. Not every dog that reacts loudly and excitedly is automatically reactive. Some dogs are simply thrill-seekers. But what exactly is the difference?

The reactive dog (due to fear or being overwhelmed)

This dog is reacting because it feels threatened, insecure, or overwhelmed. Its behavior is a sign of stress—not excitement. It’s barking at the other dog because it needs space, not because it wants to play. Typically:

• Body language appears tense, stiff, withdrawn, or unnaturally upright
• The reaction often occurs from a great distance
• The dog takes a while to calm down after the stimulus
• He isn't looking for contact—he wants distance

The dog that seeks stimulation (out of frustration or excitement)

This dog loves stimulation. He wants to go to other dogs, to people, to the bike—and because he can’t (leash!), he gets frustrated. He barks, pulls, and spins in circles. Not because he’s scared, but because he’s so excited that he can’t control himself anymore. Typically:

• Body language appears excited, forward-leaning, joyful but uncontrolled
• The dog obviously wants to go toward the stimulus
• As soon as he reaches his destination (e.g., the other dog), he quickly relaxes
• He reacts especially strongly to things he likes: other dogs, people he knows, food

The risk of confusion: Both types look similar from the outside. But the cause is completely different. And that’s why the training is different, too!

Why does a dog become reactive?

The causes of reactivity are rarely clear-cut—it is usually a combination of several factors:

• Lack of socialization during puppyhood – Dogs that have had little exposure to the world around them as puppies often become overwhelmed more easily as adults.
• Traumatic experiences —such as an attack by another dog, an accident, or a frightening situation—can have a lasting impact.
• Genetic predisposition – Some breeds or bloodlines are simply more sensitive and react more strongly to stimuli.
• Too much activity, not enough rest —yes, really. Dogs that are constantly active, busy, and kept on high alert never really get to relax—and over time, they become increasingly irritable.
• Pain or health issues – Physical discomfort can also cause a dog to lose its temper much more quickly than usual.

What can you do if your dog is reactive?

Reactivity doesn't just go away on its own. But it's something you can work on. First things first: patience. And no punishment. Because punishment increases stress—and makes everything worse.

1. Distance is your best friend

Stay away from anything that triggers your dog. It sounds simple, and it is—but you have to be consistent about it. To work effectively with your dog, you need to be far enough away from his trigger. That’s the only way he’ll have a chance to think instead of just reacting. 

2. Establishing Routines and Creating a Calm Environment

Reactive dogs need one thing above all else: rest. Many owners think that more exercise will help—but the opposite is often true. Structured rest periods, consistent daily routines, and low-stimulus times help the nervous system regulate itself. Dogs need up to 16–18 hours of sleep a day. Is your dog getting that?

3. Positive reinforcement instead of pressure

Whether it’s counter-conditioning, desensitization, or structured leash training—the goal is always the same: your dog learns that the trigger poses no danger. This works best in a positive training environment, with high-quality rewards and professional guidance.

4. Recognize the difference (and act on it)

Is your dog stimulus-seeking or reactive due to fear? This question determines the training strategy. A stimulus-seeking dog needs, above all, impulse control —learning that it cannot respond to every stimulus. A fearful, reactive dog needs, above all, security and positive associations.

5. Help reduce stress in everyday life

In addition to training, there are other ways to help reduce your dog’s overall stress levels in everyday life. These include: leisurely walks without pressure, sniffing games, relaxing time at home—and sometimes a little natural support.

Can CBD help a reactive dog?

CBD can be a useful supplement during training—especially during particularly stressful periods or if your dog tends to be very tense in everyday life.

CBD works through the endocannabinoid system, which plays a role in regulating stress responses, among other things. It can help keep your dog’s overall mood a bit calmer—so that your dog is actually able to learn in the first place.

Our products are ideal for naturally calming the heightened emotions of reactive dogs. They help restore your dog’s inner balance and can also have a positive impact on your training together.