When you live with a dog, you know very well that something special happens between you.

There’s that way they look at you, that way they come back to you when they’re unsure, that way they get closer when they’re scared, that way they greet you upon your return as if your absence had been a tragedy.

For many humans, this bond holds immense importance. It reassures, accompanies, and sometimes overwhelms. But that’s not the focus of this article.

Here, we’re mainly looking at how this bond changes things for the dog: their way of exploring, seeking comfort, managing stress, or forming an attachment to a person.

And that's already quite a lot.

Because as soon as we talk about emotions in dogs, the subject can quickly become divisive. Some still refuse to see anything other than instinct or learned behavior. Others, on the contrary, end up attributing almost human reasoning to them.

Neither of these positions deserves judgment. They mainly show our difficulty in finding the right balance.

Science now allows us to move forward more simply: a dog is neither a reflex machine nor a small human on four legs. It is a social species, capable of forming a real bond with its human.

And ethology has been studying this bond for over twenty-five years.

What science shows

The first major study dates back to 1998. Researchers Topál and colleagues adapted the Strange Situation Test, a protocol used in psychology to study attachment in young children, for dogs.

The principle is simple: the dog is placed in a room where the presence of its owner, a stranger, separations, and then reunions alternate.

The results show that dogs do not react in the same way depending on the person present. They seek more contact with their owner, are more relaxed when he is there, and return to normal behavior more easily after separations.

Since then, numerous studies have confirmed these observations.

Researchers speak of a secure base. In the presence of their primary human, many dogs explore their environment more, recover more quickly after a stressful situation, and are more confident in the face of novelty.

Attachment is therefore not just about preferring one person. It plays a real role in regulating emotions and behavior.

In 2019, Solomon and his collaborators further explored these works by seeking to distinguish different attachment profiles in dogs. Their study suggests that some dogs show more secure attachment than others, and that the way humans interact with their companions seems to influence this relationship.

However, caution is needed: these results represent an adaptation of the human model and not proof that attachment styles are strictly identical between dogs and children.

Biological mechanisms

In 2015, a study published in the journal Science greatly contributed to revealing the biological mechanisms of the human-dog bond.

Researchers led by Nagasawa observed that prolonged gaze exchanges between a dog and its owner were accompanied by an increase in oxytocin, a hormone involved in social interactions and emotional bonds.

They proposed the existence of a positive feedback loop: the more the dog and its human exchange gazes, the more oxytocin production increases, in turn reinforcing affiliative behaviors.

This hypothesis has generated much interest, but also several methodological criticisms. Some teams have notably pointed out that various factors, such as the statistical methods used or certain characteristics of the participants, could influence the results.

Today, the consensus is more nuanced: oxytocin does seem to play a role in the relationship between a dog and its owner, but it probably doesn't explain the entire complexity of this bond on its own.

Another important discovery: in 2019, Sundman and colleagues showed that cortisol levels, a marker of chronic stress, could synchronize in some dogs and their owners.

This does not mean that your emotions are automatically transmitted to your dog. However, it does show that the quality of the relationship, lifestyle habits, and shared environment can have measurable physiological effects in the long term.

What this means in everyday life

Saying that your dog sees you as a secure base is not just an image.

Concretely, your presence can help them better manage certain stressful situations. In an unfamiliar place, they will often be more inclined to explore if they know you are there. After a fright, they will generally regain their calm more quickly with a person they trust.

A quality attachment does not mean that the dog must constantly stick to its owner.

On the contrary, a secure bond promotes autonomy. The dog knows it can count on its human when needed, without experiencing every separation as distress.

Conversely, some relationships can become less balanced. Excessive dependence, significant anxiety during absences, or, conversely, avoidance behaviors can indicate a less secure attachment. However, each situation remains unique and deserves to be evaluated as a whole.

Work on stress synchronization also reminds us that daily life matters. A stable environment, predictable interactions, and a trusting relationship contribute to the dog's long-term well-being. It's not about being a perfect owner, but about providing them with consistent benchmarks.

What is often misunderstood

"He only loves me because I give him food anyway."

Food obviously plays a role in the relationship, but it doesn't explain everything.

Attachment studies show that dogs also seek proximity, comfort, and security from their human. Shelter dogs are even capable of developing a new attachment bond with a person who has only been caring for them for a short time.

"You're imagining things!"

Not really.

In research, very concrete behaviors are observed: the dog seeks its human more, explores less when separated from them, and then regains its calm more easily upon reunion.

What you feel in the relationship with your dog can therefore correspond to something real and measurable.

"He only looks at me when he wants something."

Eye contact can indeed be used to ask for a reward, attention, or food.

But it doesn't only serve this function. Research suggests that it also participates in social communication between the dog and its human, and that it is accompanied by measurable biological changes, particularly around oxytocin.

"If I'm stressed, it stresses my dog."

Again, we need to qualify that.

Studies refer to a possible synchronization of chronic stress in certain dyads, not an automatic transmission of emotions.

Lifestyle, the dog's personality, the quality of the relationship, and its environment also play important roles.

In other words, your emotional state matters, but it doesn't solely determine your companion's.

"Oh, we're just so enmeshed, it's totally healthy and normal."

Not always.

A very strong bond isn't necessarily a secure one. Some dogs seem "stuck" to their human, but experience severe distress during separation, absence, or the slightest change in routine.

The goal isn't to have a dependent dog. It's to have a dog that feels secure enough to come back to its human when needed, but also to explore, rest, and exist without being constantly on alert.

At what age is the bond formed?

The first weeks of life are important. Experiences with humans contribute to the development of future relationships.

But contrary to popular belief, not everything is set during puppyhood.

Studies show that adult dogs, including those in shelters, are capable of forming a true attachment bond with a new person when interactions are positive, regular, and secure.

This is essential information for people adopting an adult dog. Even after a difficult past, a new bond can be built with time, patience, and stable routines.

In working dogs or dogs living in a highly structured environment, this bond also exists. It may simply be expressed differently depending on lifestyle habits, the tasks assigned to the dog, and the nature of interactions with its handler.

When to consult?

It is normal for every dog to express its attachment in its own way. However, certain behaviors may warrant the opinion of a veterinarian or a behavioral professional.

This is particularly the case in the presence of:

• significant separation anxiety;

• excessive dependence on a single person;

• marked avoidance or fear reactions towards its owner;

• sudden changes in behavior after an adoption, trauma, relocation, or other significant event.

The goal is not to make the dog more dependent on its human, but to help it regain a stable, predictable, and reassuring relationship.

Before concluding that a problem is purely behavioral, a veterinary examination is essential to rule out pain or a medical condition that could explain certain changes.

Sources

• Topál J. et al. (1998). Attachment Behavior in Dogs (Canis familiaris): A New Application of Ainsworth's Strange Situation Test.

• Solomon J. et al. (2019). Attachment Security in Companion Dogs: Adaptation of Ainsworth's Strange Situation and Classification Procedures.

• Nagasawa M. et al. (2015). Oxytocin-Gaze Positive Loop and the Coevolution of Human-Dog Bonds.

• Kekecs Z. et al. (2015) ; Fiset S. et al. (2016). Critical comments on Nagasawa's study.

• Sundman A.S. et al. (2019). Long-Term Stress Levels Are Synchronized in Dogs and Their Owners.

• Gácsi M. et al. (2001). Attachment Behavior of Adult Dogs Living at Rescue Centers.