First published: World Rally Cynosport.
By Claudia Bensimoun
First published: 2014.USDAA | World Cynposport Rally
Updated 2025
Do a dog’s personality traits stay consistent over time? A look at a Department of Psychology, University of Texas, study by Samuel D. Gosling, Jamie Fratkin, David Sinn, and Erika Patall. By Claudia Bensimoun
Dog behavior expert Claudia Bensimoun breaks down a major University of Texas meta-analysis showing why puppy personality tests fail to predict adult behavior. Learn how age, environment, genetics, and training shape canine temperament over time.
Image credit: Claudia Bensimoun
Understanding whether a playful puppy will mature into a calm, confident adult has long fascinated trainers, veterinarians, and dog guardians. For decades, breeders and behaviorists have relied on “puppy tests” conducted at 7–8 weeks, believing these early snapshots could reliably predict a dog’s future temperament. But groundbreaking research from the University of Texas challenges that assumption.
In this updated 2025 review, Claudia Bensimoun, dog-behavior writer and pet journalist, writes about the influential meta-analysis conducted by Drs. Samuel Gosling, Jamie Fratkin, David Sinn, and Erika Patall. Their study analyzed 69 scientific papers on canine personality and followed thousands of dogs across breeds, ages, and working roles. The results reveal that dog personality is far more fluid than previously believed, especially during early development. That environment, training, and maturity play a much larger role than puppy testing alone.
This new understanding reshapes how we evaluate shelter dogs, select service-dog candidates, and choose puppies for family homes in 2025.
Image credit: Claudia Bensimoun
Can a playful puppy grow into a calm adult — or is personality set in stone? A groundbreaking meta-analysis from the University of Texas reveals the truth about dog personality consistency — and why “puppy tests” might not be as reliable as we thought. I dive into the science from Drs. Samuel Gosling, Jamie Fratkin, David Sinn, and Erika Patall, with a 2025 update on how this changes training and breeding today.
We’ve all heard it: “Test your puppy at 8 weeks — it predicts everything.” But this 2014 meta-analysis of 69 studies proves predictability isn’t guaranteed. “Consistency” means how much a dog’s traits (aggression, fear, activity) stay the same over time. The researchers expected moderate stability, but found it varies by trait, age, and test type.
The Study: How It Worked: Drs. Gosling, Fratkin, Sinn, and Patall analyzed data from thousands of dogs across breeds and roles (pets, working dogs). They measured five traits:
- Aggression
- Submissiveness
- Fearfulness
- Activity
- Responsiveness to training
They tested:
- Age at first test (puppy <12 months vs. adult)
- Test interval (short, medium, long)
- Working vs. non-working dogs
- Same vs. different tests
Key Question: Do puppy tests hold up when dogs become adults?
Image credit: Claudia Bensimoun
Recent studies demonstrate that the predictability of canine personality cannot be taken for granted, and many canine experts today believe that “puppy tests” measuring a dog’s behavior during the first year of life may not be quite as accurate as previously thought.
In this scientific review, “consistency” refers to the predictability of behavior. In this meta-analysis, Dr. Sam Gosling, Dr. Jamie Fratkin, Dr. David Sinn, and Dr. Erika Patall from the University of Texas discuss why predictability in dogs cannot be assumed.
From previous studies of canine personality, it appears that to fully understand it, researchers need to use meta-analytic methods to quantitatively summarize the underlying basis of canine personality and the factors that influence it.
Researchers expected that their meta-analysis would reveal that canine personality would be moderately consistent over time, but they found that the absolute level of consistency varied across personality dimensions.
They also presumed that personality in dogs would be more stable as dogs matured, thus the importance of testing during a dog’s adult years, when working dogs were used for these tests, and when aggregate measures were used, when shorter test intervals were used, and, finally, when the same test was administered in all personality testing. Jones and Gosling had questioned the wisdom of separating the fearfulness and reactivity dimensions, so researchers combined both traits.
Results
Results: What They Found
- Puppy vs. Adult Tests: Puppies retested as puppies (avg 7.84 weeks apart) vs. puppies retested as adults (47.54 weeks) — no significant difference. Puppy tests don’t predict adulthood.
- Trait Consistency:
- Most consistent: Submissiveness, aggression
- Least consistent: Fearfulness, activity, responsiveness to training
- Working vs. Non-Working: No difference — personality stability is the same.
- Test Interval & Age: Shorter intervals + adult testing + same test = slightly better consistency.
Age at First Measurement
Image credit: Claudia Bensimoun
The association between the dog’s age at the first test and the personality consistency estimate was assessed by categorizing dogs as puppies (under 12 months) or adults (12 months or older). It was found that, across both age categories, consistency estimates differed substantially.
To further test the effectiveness of puppy testing, the researchers also examined whether consistency estimates differed between puppies first tested as puppies and then retested as puppies, with an average interval of 7.84 weeks between tests.
This was compared with the testing results of puppies first tested as puppies and later tested again as adults, with an average interval of 47.54 weeks. It was concluded that, for both categories, the test estimates were significantly different from zero but not very different from one another.
Personality Testing in Puppies and Adult Dogs
Image credit: Claudia Bensimoun
The results demonstrated that responsiveness to training and fearfulness were very much less consistent than aggression and submissiveness, but not activity, which was also very much less consistent than submissiveness and less consistent than aggression.
Working Versus Non-Working Dogs
This result suggests that the differences in consistency between working and non-working dogs were minimal. There was no difference in the consistency of dog personality between the two groups.
Association Between the Test Interval and the Age of the Dog
The researchers separated the test intervals and the dog’s age during the first test. They then divided the test intervals into three categories:
Short: 10-week periods
Medium: 10-24 week periods
Long: 24 weeks or more. The results showed that consistency decreased with longer intervals. Still, adult dogs tested with the same method showed the highest stability, proving that environment and training play a bigger role than early puppy snapshots.
2025 Update: What This Means for You: Twelve years later, this study shapes modern tools such as the Dogo app’s training logs and breed-specific behavior programs. For agility handlers: Focus on adult testing and consistent cues — a fearful puppy can become confident with the right owner. Breeders: Don’t rely solely on 8-week tests.
Modern veterinary behaviorists now emphasize that a dog’s developing brain remains highly plastic throughout the first year of life. Neural pathways governing fear responses, social bonding, impulse control, and environmental resilience continue to reorganize well beyond the “puppy test” stage. Because of this, early behavior assessments often capture temporary developmental phases—such as fear periods, teething discomfort, or limited environmental exposure—rather than stable personality traits.
Canine scientists now understand that adult temperament emerges from the interplay between genetics, early experiences, socialization, owner handling skills, and ongoing environmental feedback. This aligns with our understanding of human developmental psychology, which holds that personality does not become reliably stable until adulthood.
In the end, this groundbreaking research confirms that dog personality is not fixed at birth. Instead, it evolves through a dynamic blend of genetics, age, environment, and daily interactions with humans.
While traits like aggression and submissiveness may show moderate consistency, others—especially fearfulness, activity levels, and trainability—shift significantly as dogs mature. In 2025, this science empowers dog parents, breeders, trainers, and veterinarians to focus less on 8-week predictions and more on providing consistent, positive, long-term guidance.
Dog personality isn’t fixed at birth — it’s a dance between genetics, age, and environment. Gosling’s meta-analysis shows that while some traits, like submissiveness, endure, others, like fearfulness, can shift with training and time.
In 2025, this science empowers us to raise happier, better-adjusted dogs — one consistent cue at a time. What surprised you most about your dog’s personality changes? Share below! What changes have you seen in your dog as they matured?
Sources
Gosling, S. D., Fratkin, J. L., Sinn, D. L., & Patall, E. A. (2014). Personality Consistency in Dogs: A Meta-Analysis. Psychological Bulletin, 140(1), 1–25.
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