Cannabis Research
CBD Study Shows Reduced Aggression in Senior Dogs
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For years, pet owners have whispered about the benefits of hemp for their furry companions. From soothing aching joints to helping old dogs settle down at night, the anecdotal evidence has been overwhelming. Now, the science is finally catching up.
A massive new study1 from the Dog Aging Project (DAP), published this week in Frontiers in Veterinary Science, has analyzed data from over 47,000 dogs across the United States. The findings offer some of the strongest evidence yet that CBD is becoming a staple for senior dog care, particularly for managing pain and—fascinatingly—behavioral aggression.
This research confirms what many in the hemp pet wellness community have long suspected: hemp is playing a crucial role in how we care for our aging best friends.
TL;DR: The Dog Aging Project Findings
- The Scale: Researchers analyzed data from 47,355 dogs, making this the largest comprehensive assessment of canine CBD use to date.
- The Top Uses: CBD is most commonly given to dogs suffering from dementia (18.2%), osteoarthritis, and cancer.
- The Behavior Surprise: Long-term CBD use was linked to a reduction in aggressive behaviors, though it did not statistically improve general anxiety or agitation scores.
- The Legal Link: Pet owners living in states with legal medical cannabis programs are significantly more likely to use CBD for their dogs.
Why Senior Dogs Are Most Likely to Receive CBD
The study found a clear trend: CBD is the supplement of choice for the “golden years.”
The average age of a dog taking frequent CBD supplements was 10.2 years old, compared to just 7.6 years for dogs not taking it. This 3-year age gap suggests that owners are turning to hemp specifically to manage the chronic conditions that come with aging, rather than using it as a general preventative for puppies.
The researchers found that CBD use wasn’t random. It was highly correlated with specific, serious health conditions. When traditional veterinary medicine hits a wall, or when owners want a more natural approach to symptom management, they are reaching for hemp.
| Health Condition | Prevalence of CBD Use | Insight |
|---|---|---|
| Canine Dementia | 18.2% | Owners are nearly twice as likely to give CBD to dogs with cognitive decline. |
| Osteoarthritis | 12.5% | Used heavily for joint pain and mobility issues. |
| Seizures / Epilepsy | 10.6% | Aligns with FDA-approved uses of CBD for human seizure disorders. |
| Cancer | 10.0% | Often used for palliative care and general symptom management. |
| Hip Dysplasia | 10.5% | Common in large breeds; often progresses into osteoarthritis. |
Data derived from Conrow et al., 2025. Percentages represent the portion of dogs with each condition who are given CBD.
CBD and Aggression in Senior Dogs: What the Data Shows
Perhaps the most fascinating finding in the study involved behavior. The researchers tracked dogs over time, comparing those who took CBD consistently for at least two years against those who never took it.
Dr. Maxwell Leung, senior author and director of the Cannabis Analytics, Safety and Health Initiative at Arizona State University, noted2 a distinct pattern:
“Behaviorally, dogs given CBD products for multiple years are initially more aggressive compared to dogs not receiving those products, but their aggression becomes less intense over time.”
This suggests that owners likely start using CBD because their dog is showing aggression (grumpiness, snapping, or irritability). The data shows that the decision pays off—aggression levels in the treated dogs dropped faster over time than in the untreated group.
The Anxiety Nuance
While aggression declined over time among long-term CBD users, the researchers emphasized that the study was observational. This means the findings show a strong association—not proof that CBD directly caused the improvement.
Dr. Julia Albright, co-author and associate professor at the University of Tennessee College of Veterinary Medicine, highlighted this interesting gap:
“Most canine aggression is related to underlying stress or anxiety—a fight or flight response that kicks in. It is unclear why only aggression but not other types of anxious or agitated behaviors seemed to be improved with CBD treatment.”
This could mean that CBD works best when aggression is triggered by pain (like an achy hip being touched) rather than general environmental stress (like a thunderstorm).
The “Green” Effect: Legalization Matters
The study also highlighted a cultural phenomenon: Where humans feel safe using cannabis, they feel safe giving it to their pets.
The prevalence of dog CBD use was higher in states with established medical cannabis programs. In states where cannabis is strictly prohibited, dog owners were more hesitant. “There are many similarities in how CBD can benefit dogs and humans medically,” Dr. Leung concluded, suggesting that as human acceptance grows, veterinary use follows suit.
Safety First: What to Watch For
While the study was overwhelmingly positive regarding the potential benefits for pain and behavior, it did note one common side effect. Dogs taking CBD were slightly more likely to suffer from gastrointestinal issues, specifically chronic diarrhea.
However, experts note that this is often due to the carrier oil (such as MCT or coconut oil) used in pet tinctures, rather than the cannabinoid itself. Introducing the supplement slowly, with food, can often mitigate these tummy troubles.
Dr. Albright also cautioned that owners need to be careful when selecting products. “At this point, we do not have a complete picture about the behavioral treatment plan,” she noted, referencing the lack of data on specific dosages and brands used by the survey participants.
The Future of Veterinary Hemp
The Dog Aging Project has provided a massive dataset that moves hemp from “anecdotal home remedy” to “statistically significant therapy.”
With findings linking CBD to the management of dementia, cancer symptoms, and aggression, the path is clear for more clinical trials. For the millions of Americans watching their dogs grow older, this research offers a new tool in the kit to ensure those final years are as comfortable and happy as possible.
References
1. Conrow, K. D., Haney, R. S., Malek-Ahmadi, M. H., Albright, J. D., Kaplan, B. L. F., Snyder-Mackler, N., Kerr, K. F., Su, Y., Promislow, D. E. L., Bray, E. E., Dog Aging Project Consortium, & Leung, M. C. K. (2025). Demographic features, health status, and behavioral changes associated with cannabidiol use in the Dog Aging Project. Frontiers in Veterinary Science, 12, 1666663. https://doi.org/10.3389/fvets.2025.1666663
2. Frontiers Science News. (2025, November 28). Scientists studied 47,000 dogs on CBD and found a surprising behavior shift. ScienceDaily. https://www.sciencedaily.com/releases/2025/11/251128050506.htm
