Why 99% of Dogs Have Behavior Issues and What You Can Do About It
While we often see our dogs as perfect companions, the reality is that nearly all dogs experience some form of behavioral challenge. A recent large-scale study published in the Journal of Veterinary Behavior revealed that 99.12% of dogs have at least one behavior issue, ranging from mild quirks to more serious problems. Understanding these common behaviors and learning how to manage them can strengthen the bond between you and your dog.
What Did the Study Find?
The study analyzed data from the Dog Aging Project (DAP), which collects survey responses from over 43,000 dogs. Dog owners rated their pets’ behaviors on a scale from 0 (no problem) to 4 (serious problem). Researchers found that nearly every dog had:
At least one moderately serious to serious behavioral problem (rating 3 or 4), or
Two or more moderate to serious problems (rating 2 to 4)
The results highlight that behavioral challenges are extremely common across the canine population.
The Most Common Behavioral Issues
According to the study:
Separation and attachment problems affected 86% of dogs.
Aggression was reported in 56% of dogs.
Fear and anxiety impacted about 50% of dogs.
These categories often overlap. For example, dogs exhibiting aggression might do so out of fear, and anxiety frequently relates to separation issues.
As study co-author Dr. Bonnie Beaver explained, the survey’s design separated related behaviors into different categories, so the true prevalence of some complex behaviors may be even higher.
Why Do These Behavior Issues Occur?
Several factors contribute to these widespread challenges:
Natural canine instincts: Behaviors like barking, chewing, and guarding are normal but can conflict with human expectations or living environments.
Fear and anxiety: Stressful stimuli—such as loud noises, strangers, or changes in routine—can trigger problem behaviors.
Separation anxiety: Dogs are social animals that often become distressed when left alone, leading to destructive behaviors or excessive barking.
Lack of early socialization: Puppies not exposed to diverse experiences may develop fear or aggression later.
Owner communication gaps: Many veterinarians do not routinely ask about behavior, and owners may hesitate to mention concerns, delaying intervention.
What Can You Do?
1. Work Closely With Your Veterinarian
Dr. Beaver points out that only about half of veterinarians inquire about behavior during visits. Owners should proactively discuss behavioral concerns so problems can be addressed early.
2. Learn to Read Your Dog’s Body Language
Understanding signals such as growling, lip licking, yawning, or avoiding eye contact helps prevent escalation. Aggression often stems from fear or feeling threatened, and context matters—a dog may react to a child approaching too quickly or a stranger’s direct stare.
3. Provide Consistent Training and Boundaries
Use positive reinforcement to teach desired behaviors. Clear, consistent rules reduce confusion and help your dog feel secure.
4. Gradually Manage Separation Anxiety
Help your dog become comfortable alone by starting with short absences and increasing the duration gradually. Enrichment toys and calming strategies can also reduce distress.
5. Educate Family Members, Especially Children
Children should be taught how to safely interact with dogs and respect their space to prevent misunderstandings or accidental stress.
6. Consult a Certified Trainer if Needed
Professional trainers can offer tailored techniques for managing complex or persistent behaviors.
Remember: Behavioral Issues Are Normal
Having a behavior problem does not mean your dog is “bad.” As Dr. Beaver stresses, aggression and anxiety are natural responses that serve a purpose in animal communication. With understanding and care, most behavior issues can be managed effectively.
Don’t be discouraged by statistics like the 99% figure—these behaviors are common and manageable. Instead, focus on learning about your dog’s needs and working together for a happy, balanced relationship.
Sources:
Journal of Veterinary Behavior, Dog Aging Project Survey, 2025
Texas A&M University interviews with Dr. Bonnie Beaver
Kinship, April 2025 — “A New Study Says 99% of Dogs Have Behavior Issues” by Sio Hornbuckle
