As a dog guardian in Singapore, you probably know the joy of having a dog by your side. But those joys can turn into embarrassment, frustration, and anxiety fast when your dog loses it on a walk.

Whether it’s barking at strangers, growling and lunging at other dogs, or snapping when they’re overwhelmed, reactivity is a real challenge to manage. And before you can start working on it, you need to understand what type of reactivity you’re dealing with.

What Is Reactivity in Dogs?

Reactivity in dogs refers to what we perceive as an overreaction to certain stimuli or situations. This can include barking, lunging, growling, or other intense behaviors that might occur when your dog encounters something they perceive as a threat or a source of frustration.

Think of it like being stuck in a jam along the PIE when someone cuts in front of you at the last second. A little annoying, right? Dogs experience something similar, and when they do, the response is rarely what you’d call subtle.

What It Looks Like

Reactivity can manifest in various ways, such as:

• Barking or growling at other dogs or people
• Lunging on the leash
• Whining or pacing
• Trying to hide or escape

What’s Happening Inside a Reactive Dog: The Science

When a dog reacts, their body goes into a heightened state of arousal. This involves the release of stress hormones like adrenaline and cortisol, which prepare the dog to either fight, flee, or freeze. This response is part of their instinctual survival mechanism but can be problematic in everyday situations, like a stroll through the Botanic Gardens or a lift ride in your condo building.

To override this pattern, you need to understand the emotions driving those big behaviors. Which brings us to the two types.

The Two Types of Reactivity

There are two main types of reactivity: fear-based and frustration-based. They look similar on the surface but require different approaches to address.

Fear-Based Reactivity

Fear-based reactivity occurs when a dog is scared or anxious about a particular particular person, place, dog, or thing. This type of reactivity is often seen in dogs that were not properly socialized during their critical developmental period or have had traumatic experiences in the past.

When a fearful dog encounters their trigger, they may exhibit behaviors like barking, growling, and even baring their teeth all with the objective of scaring the thing away.

The underlying purpose of fear-based reactivity is to GAIN DISTANCE from the thing they’re reacting to.

The dog is essentially saying: if I make enough noise, that thing will leave. The best defense is a good offense, as far as they’re concerned.

Frustration-Based Reactivity

Frustration-based reactivity happens when a dog can’t reach something they desperately want, like another dog or a person. This type of reactivity is driven by the dog’s desire to interact or explore but is hindered by constraints such as a leash or barrier. Frustration-based reactivity can also occur when a dog is overly excited and lacks the emotional self-control to remain calm.

Why is it Important to Know Which Type of Reactivity Your Dog Has?

Understanding whether your dog’s reactivity is fear-based or frustration-based is crucial for addressing it effectively. Each type requires different management and training approaches to help your dog cope and change their behavior. Think of it as figuring out if your dog is more of a “I’m terrified of that uncle with the umbrella” and “I just REALLY want to say hi to him and you won’t let me” type. Fear-based reactivity often requires a more gradual and gentle approach, focusing on building confidence and positive associations with the trigger. Frustration-based reactivity, on the other hand, may benefit more from self-regulation training and management techniques to prevent the dog from practicing the undesirable behavior.

Getting this distinction wrong is one of the most common reasons DIY training stalls. A dog that’s barking out of fear does not need the same training plan as a dog that’s barking because they’re frustrated they can’t get to what they want.

If your dog is barking and lunging on leash and you’re not sure where to start, you can read more about how I work with leash reactive dogs and what the process looks like here.

How to Deal with Each Type of Reactivity

Health Check

As always, the first step towards resolving any behavior problem, reactivity included, is to get a full health check up to rule out any pain or illness as the underlying cause. I often find with fear-based reactivity clients, that more often than not, there is an underlying health issue: things like joint pain or lingering stomach bugs. Makes sense right? If I’m walking around with a sore knee, I’m not going to have a lot of patience for someone rushing up to greet me either. Rule this out first.

Management

Regardless of the type of reactivity, management is a critical component of any behavior modification plan. This involves managing your dog’s environment to prevent them from practicing the reactive behavior and setting them up for success. For example, if your dog is reactive to other dogs, it’s a good idea to walk them during less busy times or avoid areas with a high concentration of dogs. Let’s just say walks around Orchard Road might be off the table for a while.

Any management plan that’s going to be effective will always include a component of meeting your dog’s needs. You can refer to a comprehensive guide on what this includes here.

Training

Training is the third key element in addressing reactivity. When working with behaviors such as these, I always recommend to work with a certified professional so that you can see the results you want, as it can be a bit of a nightmare trying to DIY a behavior change plan with all the random info available online.

Trust me. I did that before I got certified, and I regret every second I wasted trying different things I learned online because they only set Louie and I back further.

A good trainer will guide you on the latest, scientifically proven methods to help your dog change how they feel and ultimately behave in those situations. They’ll use positive reinforcement methods to desensitize your dog to their triggers and teach them alternate behaviors

For frustration-based reactivity specifically, the training plan will likely include work on patience and relaxation: teaching the dog to regulate their own arousal rather than just getting better at tolerating frustration.

Frequently Asked Questions About Leash Reactive Dogs

My dog is fine off-leash with other dogs but goes crazy on leash. Why?

This is one of the most common patterns with leash reactive dogs, and it usually points to frustration-based reactivity. Off-leash, your dog can approach, sniff, and interact naturally. On leash, they’re blocked from doing that, and the frustration builds into a reaction. The leash itself becomes part of the problem, not just the other dog.

My dog only reacts on walks. At home they’re perfectly calm. Does that mean they’re not really reactive?

No, it means the environment is doing a lot of the heavy lifting at home. Familiar surroundings, no unpredictable triggers, lower baseline stress. Out on a walk, especially in a dense urban environment like an HDB estate or a busy condo, the sensory load is much higher, and a dog who copes fine at home can tip over threshold quickly.

Will my dog grow out of reactivity?

Unlikely without intervention. Reactivity tends to be self-reinforcing: the dog reacts, the trigger moves away (or the guardian removes them from the situation), the dog learns that reacting works. Without a structured behavior modification plan, most dogs don’t improve on their own, and some get worse over time.

Is my reactive dog aggressive?

Not necessarily. Reactivity and aggression exist on a spectrum, and many reactive dogs are operating from fear or frustration rather than a genuine intent to cause harm. That said, an untreated reactive dog can escalate over time. If your dog has made contact (snapping, biting), that warrants an assessment with a qualified professional rather than a wait-and-see approach.

If your dog is barking, lunging, or shutting down on walks and you’re not sure what’s driving it, learn more about how I help guardians whose dogs are leash reactive and what the process looks like here.

Conclusion

Reactivity is a common behavior that crops up in dogs, but it’s not impossible to address. By understanding the two main types: fear-based and frustration-based, and using a combination of management and positive reinforcement training, you can help your dog become a more well-adjusted and confident companion.

Remember, every dog is unique, so it’s essential to work with a qualified professional to develop a training plan tailored to your dog’s specific needs.