A small randomized double-blind placebo-controlled canine trial reported improvements in fear/anxiety scores and urinary cortisol measures with a standardized ashwagandha root extract. That is genuine dog-specific clinical evidence, but it comes from a single 24-dog study of one named extract.
The evidence is therefore promising but insufficient for a broad claim that ashwagandha supplements calm dogs.
Key takeaways
- A 2022 randomized placebo-controlled study enrolled 24 dogs with stress/anxiety signs.
- The tested intervention was KSM-66®, a standardized ashwagandha root extract.
- Fear/anxiety scores and urinary cortisol-to-creatinine ratio improved versus placebo.
- One small trial is not enough to generalize across extracts, doses or commercial formulas.
- A cortisol change should not be treated as equivalent to every behavioral outcome.
What was actually studied?
The trial lasted four weeks and enrolled 24 client-owned dogs, randomized 12 per group.
Dogs received placebo or 15 mg/kg body weight of KSM-66 ashwagandha root extract once daily.
Outcomes included:
- C-BARQ behavioral domains;
- urinary cortisol-to-creatinine ratio;
- Canine Brief Pain Inventory;
- body condition.
The intervention was well tolerated in the study.
What did the study find?
Compared with placebo, the ashwagandha group showed a statistically significant reduction in urinary cortisol-to-creatinine ratio and improvement in a fear/anxiety behavioral domain.
These findings are encouraging because the study included both behavioral and physiological measures.
But the study remains exploratory:
- only 24 dogs were enrolled;
- treatment lasted four weeks;
- it was conducted at one center;
- only one standardized extract was tested.
Why extract identity matters
Botanical evidence is extract-specific.
KSM-66 is a defined root extract. Evidence for that preparation cannot be generalized automatically to:
- generic ashwagandha powder;
- leaf/root mixtures;
- other standardized extracts;
- multi-herb calming chews;
- products with unspecified withanolide composition.
For Dog Supplement Facts interpretation:
one ashwagandha extract ≠ all ashwagandha products
Cortisol is not the same as behavior
The urinary cortisol result is supportive, but physiological stress markers and observed behavior are different endpoints.
A product should not be called clinically calming solely because it changes cortisol.
Dog Supplement Facts evidence status
INSUFFICIENT — PROMISING, EXTRACT-SPECIFIC EVIDENCE
The positive randomized trial justifies interest and further research, but not a broad efficacy claim.
What the evidence does not prove
- every ashwagandha product reduces anxiety in dogs;
- human ashwagandha evidence applies directly to dogs;
- KSM-66 results apply to other extracts;
- cortisol reduction equals treatment of a diagnosed anxiety disorder;
- ashwagandha can replace veterinary behavioral assessment or medication.
Related Dog Supplement Facts content
- Dog Calming & Stress Guide
- Alpha-Casozepine for Dogs
- Tryptophan for Dogs
- Do Calming Chews for Dogs Work?
- Dog Calming & Stress Comparison
References
- Kaur J, Seshadri S, Golla KH, Sampara P. Efficacy and safety of standardized Ashwagandha (Withania somnifera) root extract on reducing stress and anxiety in domestic dogs: a randomized controlled trial. Journal of Veterinary Behavior. 2022;51:8–15. doi:10.1016/j.jveb.2022.03.002.