Are Some Dog Breeds More Anxious? Vet Explains

• Research shows genuine breed differences in several fear- and anxiety-related behaviors.

• Different breeds may be predisposed to different types of anxiety rather than simply being "more anxious."

• Genetics influence fearfulness, but breed alone is a relatively poor predictor of an individual dog's behavior.

• Early socialization, life experiences, activity, training, health, and environment can substantially modify a dog's risk.

• Smaller dogs have shown higher rates of some types of social and non-social fear in several large studies, although size is only one factor.

• Working ancestry can influence behavioral tendencies, such as sensitivity to movement or environmental changes, without necessarily causing an anxiety disorder.

• A sudden change in behavior should not be blamed on breed. Pain, illness, sensory decline, or another medical problem should be considered.

• Choosing responsible breeders who prioritize stable temperament can help reduce inherited vulnerability to fear.

There does appear to be a genetic component to canine fear and anxiety.

One of the largest studies in this area examined behavioral data from more than 13,700 Finnish pet dogs representing 264 breeds. Researchers found substantial breed differences across several anxiety-related traits, including noise sensitivity, general fearfulness, compulsive behavior, separation-related behavior, and fear of surfaces and heights.

That does not mean there is a single "anxiety gene," however.

Behavior is what scientists call a complex trait. Many genes probably contribute small effects, while environmental influences determine how those genetic tendencies are expressed.

We can think of genetics as adjusting the sensitivity of a dog's alarm system. One dog may be born with the dial set relatively low, so unfamiliar noises barely register. Another may start life with that dial turned higher and require more careful socialization and positive experiences to become confident.

Research has identified specific genetic regions associated with fearfulness. For example, a genomic study of Great Danes identified a region on chromosome 11 associated with fearfulness, adding to evidence that anxiety-related traits can have an inherited component.

More recent genomic work has also found measurable heritability for social fear and non-social fear, suggesting that selective breeding could potentially reduce the frequency of these traits over generations.

But inherited vulnerability is very different from inevitability.

This is where the answer becomes more complicated, because there is no scientifically useful league table of "most anxious dog breeds."

Different studies measure different behaviors, and a breed associated with one type of fear may not have an increased risk of another.

For example, a dog may be perfectly relaxed around people but terrified of fireworks. Another may sleep through thunderstorms yet hide whenever strangers enter the house.

In a large 2020 study of social fearfulness, researchers found breed differences in fear of unfamiliar people and other dogs. Chihuahuas, Shetland Sheepdogs, and Spanish Water Dogs were among the breeds showing relatively high levels of social fear in that particular population, while Pembroke Welsh Corgis, Cairn Terriers, and Soft-Coated Wheaten Terriers showed lower levels.

That finding is useful scientifically, but it should not be translated into "Chihuahuas are anxious" or "Corgis are fearless."

These results describe population averages, not individual dogs.

You could easily meet a highly sociable Chihuahua and a cautious Corgi. Within-breed variation is substantial.

There is some evidence that smaller dogs show higher rates of certain fearful behaviors.

In the Finnish study of social fear, small dogs were more likely than medium or large dogs to show fear of other dogs. Small body size remained associated with social fear even after researchers considered several other factors.

Another study examining more than 13,000 dogs found a tendency toward greater non-social fear in smaller breeds.

There are several possible explanations.

Genetics may play a role. Breeding for very small body size could unintentionally preserve behavioral characteristics associated with heightened reactivity or vigilance.

Our behavior toward small dogs may matter too.

People can physically remove a small dog from uncomfortable situations much more easily than a 90-pound dog. If a frightened Chihuahua growls at a visitor, someone may pick them up. If a German Shepherd does the same thing, the response is usually rather more deliberate.

That difference in handling could influence how dogs learn to cope with stressful situations.

Small dogs can also experience the world very differently. Other dogs, unfamiliar humans, bicycles, children, and household activity are literally larger relative to their own bodies.

So size may influence risk, but "small dog syndrome" is not an adequate medical or behavioral explanation for anxiety.

Owners often describe Border Collies, Australian Shepherds, German Shepherds, and other herding breeds as highly sensitive dogs.

There may be a biological reason for some of that perception.

Dogs developed for herding have historically been selected to notice movement, respond rapidly to environmental changes, and work closely with humans. Those qualities can be extremely useful in a working environment.

In an ordinary household, however, a nervous system designed to notice tiny changes can sometimes have rather more information to process than its job description expected.

Large-scale genomic research examining behavioral differences across dog lineages found an association between herding ancestry and non-social fear.

That does not mean herding dogs are inherently anxious.

Many are confident, adaptable dogs. But traits such as environmental sensitivity, vigilance, high arousal, and rapid responsiveness can potentially interact with inadequate socialization or stressful experiences.

A sensitive dog living in a predictable environment with appropriate exercise, training, rest, and mental stimulation may thrive. The same underlying sensitivity in a chaotic environment may be much harder for the dog to manage.

Some toy breeds appear frequently in studies of fearfulness, particularly Chihuahua-type dogs.

Again, we need to avoid turning a statistical association into a personality label.

Toy breeds encompass a huge variety of temperaments, and breeding practices also vary substantially between individual lines.

One important factor is that companion dogs are not always selected as rigorously for behavioral characteristics as dogs bred for specific working roles.

A working sheepdog that cannot cope with ordinary sights, sounds, people, or other animals may struggle to perform its job. Historically, that created some selection pressure for functional behavior.

Dogs bred predominantly for appearance may not have experienced the same behavioral selection.

Responsible companion-dog breeders increasingly recognize this and consider confidence, resilience, sociability, and parental temperament alongside physical characteristics.

Breed seems to be considerably less useful for predicting separation-related problems than many owners assume.

Some breeds are frequently described online as especially susceptible because they bond closely with people, but scientific findings are inconsistent.

A large comparison of genetically related breed groups found differences in several behavioral characteristics but did not identify significant breed-group differences in separation-related anxiety.

The Finnish study did find breed differences in separation-related behavior, but these patterns differed from those seen with other anxiety traits.

This illustrates why "anxious breed" is too crude a label.

Noise sensitivity, social fear, generalized fearfulness, and separation-related distress are overlapping but distinct behavioral problems.

Probably less than most people expect.

A major 2022 study published in Science examined behavioral survey data from 18,385 dogs and genetic data from more than 2,000 dogs.

Many behavioral traits were heritable, meaning genetics genuinely contributed to their variation.

Yet breed ancestry explained only about 9% of behavioral variation among individual dogs.

That is an extremely useful number to keep in mind.

Breed can tilt the probabilities, particularly for certain behaviors. But most of what makes an individual dog behave the way they do cannot be explained simply by reading the breed label.

This matches what veterinarians and behavior professionals see in practice.

I have met dogs belonging to supposedly "bold" breeds who trembled during an examination and dogs from breeds considered sensitive who wandered into the consulting room, accepted treats, and appeared ready to take over reception.

Breed gives us background information. The dog standing in front of us gives us much better information.

Several factors can alter how inherited behavioral tendencies are expressed.

Experiences during puppyhood have a powerful influence on future behavior.

Puppies need gradual, positive exposure to people, dogs, environments, surfaces, household sounds, handling, transport, and everyday life.

The goal is not maximum exposure. Flooding a puppy with overwhelming experiences can have the opposite effect.

Large observational studies have found poorer puppy socialization associated with both social and non-social fear later in life.

Breed is only part of a dog's genetic story.

Temperament can differ substantially between families within the same breed. A puppy produced from confident, behaviorally stable parents may have a very different inherited risk profile from another puppy of exactly the same breed.

When buying a puppy, I therefore encourage people to look beyond breed descriptions.

Ask about the temperament of both parents. Find out whether close relatives have significant noise fears, separation problems, reactivity, or difficulty coping with unfamiliar environments.

Behavioral health deserves a place beside hip scores, eye tests, and other physical screening.

Dogs learn associations remarkably quickly.

One frightening encounter with another dog can create lasting caution. Pain during grooming can turn nail clipping into a battle. A frightening thunderstorm may establish a noise fear that becomes stronger after repeated storms.

Genetics can influence how strongly a dog responds, but experience helps determine what the dog becomes afraid of.

Fearfulness has also been associated with environmental and lifestyle factors.

Dogs participating regularly in training or activities have shown lower rates of some forms of fearfulness, while urban living has been associated with increased social and non-social fear in observational research.

That does not prove city life causes anxiety. Urban dogs encounter more traffic, people, dogs, construction, elevators, confined spaces, and unpredictable noises, while lifestyle and owner factors may differ too.

Still, it reinforces an important point: behavior develops from an ongoing conversation between genes and environment.

You cannot rewrite your dog's genetics, but you can influence many of the factors surrounding them.

For puppies, prioritize calm, positive socialization rather than trying to expose them to everything imaginable before a particular deadline.

Teach predictable routines and reward curiosity.

Allow frightened dogs enough distance from triggers to feel safe instead of forcing them closer in the hope that they will "get used to it."

Regular exercise, enrichment, sleep, training, and opportunities for appropriate social interaction also support behavioral health.

Most importantly, intervene early.

Mild hesitation is much easier to address than a fear response that has been practiced hundreds of times.

If anxiety is already affecting everyday life, speak with your veterinarian. Significant anxiety may require a combination of environmental management, behavior modification, and sometimes medication.

One mistake I particularly want owners to avoid is dismissing a change as "just the breed."

If a previously confident dog suddenly becomes anxious, restless, irritable, clingy, noise-sensitive, or reluctant to do familiar activities, consider a medical explanation.

Pain is an especially important possibility.

Vision or hearing changes, neurological disease, endocrine disorders, gastrointestinal discomfort, cognitive decline in older dogs, and other health problems can also change behavior.

Breed predisposition does not explain a sudden behavioral change.

Your dog's behavior is information. If that information changes noticeably, it deserves investigation.

Some breeds do have higher rates of particular anxiety-related behaviors, so breed and genetics are genuinely part of the picture.

They are not the whole picture.

Large studies consistently show that dogs within the same breed vary enormously, while socialization, experience, health, environment, training, and individual genetics all help shape behavior.

For me, the most useful way to think about breed is as a risk factor rather than a forecast.

Knowing that a dog may be predisposed to noise sensitivity or social fear gives us an opportunity to build confidence early, choose appropriate environments, recognize warning signs sooner, and seek help before anxiety becomes deeply established.

That is far more useful than deciding that a frightened dog is simply "being their breed."