Valerian Root vs. Chamomile for an Anxious Dog: What the Evidence Actually Supports

By Koranda Walsh, VMD, DACVIM (SAIM), DACVP (CP)

Comparisons · August 9, 2026 · 6 min read

Chamomile has more mechanistic and historical support; valerian has real effects but a smaller, more mixed dog-specific dataset.

A terrier mix named Pepper came into my exam room after her owner’s third move in two years — eleven pounds, four years old, and pacing the exam table before I’d even opened the door. The owner had already tried two different “calming chews” off the shelf, one built around valerian, one around chamomile, and neither seemed to be doing much. She wanted to know which ingredient actually worked. I told her what I tell most owners asking this question: neither one is going to fix a dog who’s afraid of the world, but they’re not interchangeable either, and the label rarely tells you which one you’re actually buying.

The myth: they’re basically the same “natural calming herb”

Pet supplement marketing tends to lump valerian and chamomile into one bucket — “calming botanicals” — as if the choice between them is a coin flip. It isn’t. They come from different plant families, work through different (and differently studied) mechanisms, and have very different depths of research behind them, even though both sit in the same aisle with the same vague “relaxation support” claim on the front of the bag.

What valerian root actually has behind it

Valerian’s proposed mechanism runs through GABA receptors in the brain — the same inhibitory pathway targeted by prescription anxiolytics, just at a much gentler dose. The dog-specific evidence is real but mixed. In one study covered by PetMD, 28 dogs exposed to a valerian-containing diffuser for 30 days produced improvement reports from 43% of owners, but no statistically significant change in the frequency of anxiety-related behaviors was measured. Other work has found valerian scent cloths reduced vocalizing and increased resting behavior in a shelter setting, and newer research using EEG and neurochemical markers has picked up some signal in serotonin and dopamine activity — but not consistently across every measure tested. As the veterinary team at Vet Help Direct puts it, there’s currently little robust evidence that valerian meaningfully reduces stress in dogs or cats, even though the plausibility and clinical anecdote are both there.

What chamomile actually has behind it

Chamomile’s case rests more on a well-characterized mechanism and a long track record than on dog trials. Its active compound, apigenin, is thought to bind GABA receptors and support serotonin activity, the same pathway implicated in human anxiolytic and sedative effects that have been studied far more extensively than any canine trial. Coverage from Great Pet Care is straightforward about the gap: most of what we know about chamomile’s calming effect comes from human and rodent studies, not dogs specifically, and direct canine evidence remains thin despite how widely the herb is used in pet products. What chamomile does have is a long safety record and low pill/palatability burden compared with some other calming actives, which matters more than it sounds like when you’re the one trying to get a supplement into a dog that already doesn’t trust new things.

That gap between “plausible mechanism” and “dog-specific proof” is exactly where I spend most of my exam-room time, because it’s also where the marketing gets ahead of the label.

Why quality control matters more than the ingredient debate

Here’s the part owners skip past: neither valerian nor chamomile is FDA-approved or dosage-standardized for dogs, which means what’s actually in the tin depends entirely on the manufacturer. Before I look at which herb a product uses, I look at whether the company is accountable for what’s on that label. The National Animal Supplement Council runs an independent third-party audit program — the NASC Quality Seal — that checks a manufacturer’s quality control manual, adverse-event reporting, and label accuracy. It isn’t a guarantee of efficacy for any single ingredient, but it is a reasonable proxy for whether the milligrams on the label match the milligrams in the tin, which is a question neither valerian nor chamomile research can answer for you.

In my practice, I’ve watched this play out the same way more times than I can count: an owner brings in a bag of calming chews, convinced the ingredient failed, when the actual problem was a product with no batch testing and an inflated dose claim. I ask to see the label before I comment on the herb. Reference intervals and analyte results tell me what a dog’s bloodwork actually says; a supplement label, read carefully, tells me roughly the same thing about what I’m actually giving that dog. Most owners have never been shown how to read one — what “active ingredient” versus “proprietary blend” means, whether a milligram dose is even disclosed, whether the company discloses third-party testing at all. Once they know what to look for, the valerian-versus-chamomile debate usually resolves itself into a simpler question: which company can show its work.

The sequence I actually recommend

For a genuinely anxious dog — not just a dog who’s mildly fussy on car rides — I don’t reach for either herb as a first move. I start with the trigger pattern: what specifically sets the dog off, how often, and how severe the response is. From there:

1. Rule out pain or a medical driver of the anxious behavior before layering on a supplement.
2. If a calming botanical is reasonable to try, choose the one with a disclosed, tested dose from an NASC-audited manufacturer over an untested house brand — regardless of whether it’s chamomile or valerian.
3. Chamomile is my more comfortable default for mild, situational stress given its safety track record, even with thin direct canine data.
4. Reserve valerian for dogs who haven’t responded to chamomile, and set expectations honestly: the dog-specific evidence is inconsistent, not absent.
5. If neither produces a meaningful change within two to three weeks, that’s a signal to bring in your veterinarian for a real behavior plan rather than rotating through more calming chews.

For dogs whose anxiety shows up specifically around car rides rather than as a general pattern, the ingredient math shifts a little — our ginger-versus-chamomile breakdown for car sickness covers that narrower case in more depth. And because so much of this decision comes down to what’s actually in the product, it’s worth reading through how chew, powder, and liquid formats compare before you pick a delivery method your dog will actually take.

I still think about Pepper’s owner sometimes. We ended up switching her onto an NASC-audited chamomile chew, paired with a desensitization plan for the moving-related triggers, and checked back in six weeks later — not because the herb was a fix on its own, but because it gave us a low-risk starting point while the real behavioral work caught up. That’s the honest use case for either of these ingredients: a supporting piece, not the plan.

Where this leaves the verdict

If I had to pick one botanical to recommend by default, it’s chamomile — not because the dog-specific trial data is strong, but because the mechanism is well understood, the safety margin is wide, and it’s easier to source from a properly audited manufacturer. Valerian isn’t wrong to try, but the evidence is thinner and more mixed, and I’d want to see a disclosed dose and NASC seal before trusting any product built on it. Either way, don’t let the ingredient debate substitute for reading the label — or for ruling out a medical cause before you call it anxiety.