Part 1 of the Soul Dogs Resources & Rescue Centre Reactivity Series

“You’re not failing—you may just not have the right information yet.”

Few words carry as much misunderstanding in the dog world as “reactive.” It has become a label that’s often used to describe any dog that barks, lunges, growls, or becomes overwhelmed in public. Unfortunately, this oversimplification can prevent owners from understanding what their dog is actually trying to communicate.

At Soul Dogs Resources & Rescue Centre, we believe behavior is communication before it is a problem. Reactivity is not a personality trait, a diagnosis, or a sign that a dog is “bad.” It is an emotional response that tells us a dog is struggling to cope with something in their environment.

Understanding that distinction is often the first step toward helping both dogs and the people who love them.

What Is Reactivity?

A reactive dog is one that responds to an everyday stimulus with a level of intensity that is disproportionate to the situation. Rather than calmly observing or disengaging from a trigger, the dog may bark, lunge, growl, vocalize, freeze, or become hyper-focused.

These responses are driven by emotion—not defiance.

While aggression and reactivity can sometimes overlap, they are not interchangeable. Many reactive dogs are attempting to create distance from something they find frightening or overwhelming, while others are desperately trying to reach something they cannot access. Understanding the motivation behind the behavior is far more important than simply labeling the behavior itself.

Where Does Reactivity Come From?

There is rarely a single cause.

Instead, reactivity develops through a combination of biological, environmental, and emotional influences that shape how a dog experiences the world.

Some dogs may be genetically predisposed to heightened sensitivity or anxiety. Others may have experienced inadequate socialization during important developmental periods, traumatic events, chronic stress, pain, illness, or repeated situations where they felt unsafe.

A dog’s learning history also plays an important role. If barking or lunging has successfully made scary things move away in the past, those behaviors can become reinforced over time—not because the dog is trying to be dominant or stubborn, but because the behavior worked.

Current research also suggests that chronic stress affects a dog’s ability to regulate emotions. Just as people have difficult days, dogs accumulate stress from their daily experiences. Sleep quality, physical health, environmental changes, and repeated exposure to stressful situations all influence how well a dog can cope with new challenges.

Rather than asking, “What’s wrong with my dog?” we encourage owners to ask a different question:

“What might my dog be experiencing right now?”

That shift in perspective changes everything.

Recognizing the Early Signs

One of the biggest misconceptions about reactive dogs is that the barking or lunging is the beginning of the problem.

In reality, those behaviors are often the end of a long chain of communication.

Long before a dog explodes into a reaction, they frequently display subtle changes in body language that indicate they are becoming uncomfortable. Learning to recognize these signals allows owners to intervene earlier and better understand their dog’s emotional state.

Some common early indicators include:

• Becoming unusually still or tense
• Fixating on a person, dog, or object
• Closing their mouth after previously panting
• Ears pinned back or rigidly forward
• Tail carried unusually high, low, or tucked
• Raised hackles
• Excessive panting unrelated to temperature
• Pacing or restlessness
• Ignoring familiar cues or food
• Difficulty disengaging from a trigger

Not every dog will display every sign, and body language should always be interpreted as a whole rather than focusing on one signal in isolation. Having a professional evaluate the behaviours could help you change your dogs behavior as they are trained to see every minor movement building up to a reaction. The more familiar you become with your own dog’s normal behavior, the easier it becomes to recognize when something has changed.

Reactivity Is About More Than the Dog

Living with a reactive dog can be emotionally exhausting.

Many owners begin avoiding walks, changing their routines, or feeling embarrassed when their dog reacts in public. Over time, these experiences can create feelings of isolation, frustration, guilt, and even self-doubt.

One of the most important things we want owners to know is this:

You are not alone.

Thousands of families experience life with reactive dogs, and seeking education is not an admission of failure. It is one of the most compassionate decisions you can make for your dog. It gives your dog the comfort to utilize you for advocacy when needed, it increases the bond between you and your dog, and it can even teach humans to be more emotionally aware and empathetic in their everyday lives. 

Looking Beyond the Behavior

At Soul Dogs Resources & Rescue Centre, we don’t believe behavior exists in isolation.

A dog’s physical health, emotional wellbeing, environment, relationships, and previous experiences all contribute to how they respond to the world around them. Before any meaningful behavior change can occur, those pieces deserve to be understood.

Rather than asking how to stop a behavior, we encourage people to become curious about why it exists in the first place.

Because when we understand the emotion behind the behavior, we are far better equipped to help the dog.

What’s Next?

This article is the first of many but we wanted to lay an easy framework to help you know what a reactive dog is and to be more mindful of signs you may not have noticed before. Stay tuned for the next article to understand what it is like living with a reactive dog, what strategies are there to help you cope and whatever comes next. 

Sources

Bray, E. E., Otto, C. M., Udell, M. A. R., Hall, N. J., Johnston, A. M., & MacLean, E. L. (2021). Cognitive characteristics of working dogs. Frontiers in Veterinary Science, 8, 644431. https://doi.org/10.3389/fvets.2021.644431

McPeake, K. J., Collins, L. M., Zulch, H., & Mills, D. S. (2021). The Canine Frustration Questionnaire—Development and validation of a new psychometric tool for measuring frustration in domestic dogs. Frontiers in Veterinary Science, 8, 664945. https://doi.org/10.3389/fvets.2021.664945

Salonen, M., Sulkama, S., Mikkola, S., Puurunen, J., Hakanen, E., Tiira, K., Araujo, C., & Lohi, H. (2020). Prevalence, comorbidity, and breed differences in canine anxiety in 13,700 Finnish pet dogs. Scientific Reports, 10, 2962. https://doi.org/10.1038/s41598-020-59837-z

Mills, D. S., Demontigny-Bédard, I., Gruen, M., Klinck, M. P., McPeake, K. J., Barcelos, A. M., Hewison, L., Van Haevermaet, H., Denenberg, S., Hauser, H., Koch, C., Ballantyne, K., Wilson, C., & Mathkari, C. V. (2020). Pain and problem behavior in dogs and cats. Animals, 10(2), 318. https://doi.org/10.3390/ani10020318

Hernádi, A., Kis, A., Turcsán, B., & Topál, J. (2023). Environmental and social factors associated with stress-related behaviours in companion dogs. Animals, 13(7), 1211.

Mariti, C., Ricci, E., Zilocchi, M., Carlone, B., Sighieri, C., & Gazzano, A. (2020). Dog owners’ ability to recognize signs of stress in dogs. Animals, 10(9), 1579. https://doi.org/10.3390/ani10091579