New Analysis Finds Dog Behavior Problems Less Common Than Previously Reported

For years, dog owners have been bombarded with alarming headlines suggesting that most dogs suffer from significant behavioral problems, including  aggression (reactivity), and separation anxiety. But a new study published in the Journal of Veterinary Behavior challenges those claims, arguing that previous estimates may have dramatically overstated the prevalence of serious behavior issues in dogs.

Researchers took a fresh look at findings from a previous study that generated considerable media attention. Those earlier results suggested that nearly half of all dogs suffered from moderate to severe anxiety, and more than half exhibited moderate to severe aggression, and an astonishing 86 percent experienced moderate to severe separation anxiety.

The new analysis, conducted by researchers James Serpell and Lauren Powell of the University of Pennsylvania, revisited data from more than 43,000 dogs evaluated using the mini C-BARQ (Canine Behavioral Assessment and Research Questionnaire), one of the most widely used tools for measuring canine behavior.

According to the new paper, those conclusions stemmed largely from how the data were analyzed and how certain behaviors were categorized.

More Realistic Findings

When Serpell and Powell re-analyzed the same dataset using different statistical methods, they found substantially lower rates of behavioral concerns. Depending on the category, moderate to severe fear- and anxiety-related behaviors ranged from approximately 14 to 28 percent. Separation-related behaviors were estimated at about 9 percent, while aggression varied considerably depending on the situation being measured.

The findings are more consistent with previous canine behavior research and with what many veterinarians, trainers, and veterinary behaviorists observe in practice.

One reason the numbers matter is that behavior problems remain one of the leading causes of frustration for dog owners and can contribute to relinquishment of dogs to shelters. However, researchers caution that not every unwanted behavior should automatically be considered a behavioral disorder.

For example, a dog that barks at strangers approaching the home, growls when startled, or becomes mildly distressed when left alone may be displaying normal canine behavior rather than a clinical problem. Whether a behavior becomes problematic often depends on the owner’s expectations, living situation, and ability to manage the behavior. Dogs are only doing what comes perfectly naturally to them.

The study also highlights an important challenge in canine behavioral research: defining what constitutes a “problem.” Survey tools such as the C-BARQ, available at are valuable for identifying trends across large populations of dogs, but they cannot fully account for individual circumstances or owner perceptions.

That distinction matters because statistics often shape public understanding. When studies report that most dogs are anxious or aggressive, owners may begin to view normal canine behaviors through a pathological lens. The new analysis suggests a more balanced interpretation may be warranted.

Never Ignore Unwanted Behaviors

None of this means behavior problems should be ignored. Fear, anxiety, stress, aggression, and separation-related distress remain important welfare concerns that can significantly affect both dogs and their families. What’s more, it’s not unusual for behavior problem to have a medical explanation.

For dog owners, the message is encouraging: While behavior issues certainly do exist and deserve attention, most dogs are not suffering from severe behavioral disorders.