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Why are Dogs so Loyal to Humans? What Science Says

Nicole Cosgrove Profile Picture

By Nicole Cosgrove

human holding dog's paw

As diverse as breeds have become over the centuries, loyalty is one characteristic we expect from any dog. It’s easy to take for granted but also something we appreciate as singular to man’s best friend.

Despite being only one of many domesticated animals throughout history, a dog’s devotion to people raises some intriguing questions. Why are dogs so loyal to humans? What makes them more protective, affectionate, and agreeable toward their owners than other pets?

We’ll unravel our unique relationship and storied history with dogs to understand how they became such committed companions.


Why Are Dogs Loyal to Humans?

The modern dog’s loyalty is the product of their physical and social evolution over several millennia. As the descendants of wolves, dogs were man’s first domesticated animal. Pre-agriculture humans may have connected with wolves as early as the end of the last ice age, over 20,000 years ago.

Early domestication was practical for both parties. Hunter-gatherers used wolves for tracking and killing animals, while wolves stayed around humans when offered food. Domestication occurred alongside rudimentary selective breeding by humans and within wolf populations.

For their part, humans wouldn’t tolerate certain animals. They culled aggressive wolves and only took in those fearless enough to approach people. At the same time, wolves would face less pressure in the pack, thanks to humans. With reduced competition for mates and resources, some traits became less critical for their survival.

wheaten terrier dog with his owner
Photo Credit: katamount, Shutterstock

Wolves and the Foundation of Loyalty

Although humans may have fine-tuned it, loyalty was already established in early wolf-dogs. Fundamentally, dogs and wolves are pack animals within a hierarchy, with all members loyal to the group. Wolves are incredibly cooperative.

In one experiment 1, researchers discovered wolves were equally able to communicate with people to solve a collaborative task, showing a high social ceiling they undoubtedly lent to dogs.

Dogs inherited the tolerance, inhibition, and attentiveness wolves show to fellow pack members.

The difference appears in where they show their loyalty. The study comparing dogs and wolves in a string-pulling task found that although both species could work cooperatively with humans, the wolves were likely to disregard them or take the lead. Meanwhile, the dogs more often waited to follow their person’s guidance.

Some scientists theorize dogs developed this deferential behavior toward humans during their domestic history. They aren’t more cooperative than wolves. But they direct that attitude more towards humans than their kind.

Indeed, wolves work well together to raise their young, hunt, and survive, maintaining functional relationships even during conflict. Dogs are less likely to tolerate other dogs, instead opting to avoid conflict and cooperate more with humans.

Selective Breeding

As civilization advanced, dogs became widespread globally. Breeds grew more diverse, taking shape according to local conditions and the needs of their people. Ancient Malamutes, for example, had thick fur and powerful bodies to haul cargo in their native Alaska.

Meanwhile, ferocious Molossus dogs had enormous frames to aid Roman conquerors as war dogs. Over the centuries, specialized hunting functions, herding, and other duties created more breeds.

While physical traits unsurprisingly passed to later generations, behavior also persevered. Border Collies, for instance, are more prone to nipping due to a herding background. Differences exist between individuals due to life experience, but genetics plays a clear role in defining behavioral traits. Scientists discovered as much in a 2019 study pulling C-BARQ survey data from dog owners to explore behavioral and genetic differences among breeds.

The researchers found 131 genetic variants playing significant roles (alongside upbringing and environment) in determining traits like stranger-directed aggression, predatory chasing, and excitability. As we measure a dog’s loyalty to humans in traits like biddability and friendliness, we can see it’s written into their DNA!

puppy Border Collie gives paw
Photo Credit: Ann Tyurina, Shutterstock

Divider-Dog Paw and Bone- New

Are Dogs Loyal to Owners?

Now that we know why dogs are loyal, a new question arises: How loyal are they? Any responsible dog owner has enough experience to say their dogs are loyal to them and their family. Stories abound of dogs fearlessly protecting children, waiting for hours or even days for owners to return, and offering affection in moments of sorrow.

While its expression might vary between breeds and individuals, loyalty is typical of any dog.

If the vast amounts of anecdotal evidence suggest a dog’s loyalty to an owner and family, the science practically proves it. Studies show dogs closely connect with owners, identifying them by their face, smell, and voice.

They display a clear general preference for owners versus other stimuli. In one study, the dogs in the sample even showed a higher emotional response toward the anticipation of owner praise than a food reward!

Dog-Human Relationship

Humans and dogs, both social animals, have an exceptional ability to bond. Compared to other stimuli, including unfamiliar people and food, an owner’s praise or presence often does more to activate reward centers in the dog’s brain.

Specifically, researchers have found owners consistently increase activity in the caudate nucleus. Alongside reward detection, this area of the brain affects learning, memory, motivation, and even feelings of love.

What makes the owner so special? Dogs develop unique relationships with humans based on attachment. Scientists relate their neural processes when getting praise to that of a child in an infant-mother relationship.

Unlike the casual relationship with people outside the home, dogs trust owners because they are a secure base and a safe haven. Dogs depend on owners as a reference point and security when exploring new places or situations. As safe havens, owners offer a place to retreat when the dog is in danger. Just as a child seeks comfort from their mother, a dog needs attention from their owner.


Final Thoughts

Canines have come a long way in their domestic history. The modern dog’s connection to man is intrinsic and essential to survival. From the outset, it pushes them toward loyal, cooperative relationships with people. Yet, nature only tells half the story.

Dogs are still individuals shaped through experience. While domestication gave dogs the capacity to bond and show loyalty to humans, it’s up to their people to make the most of that potential.

Featured Photo Credit: Pixabay

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