Passionflower vs Valerian Root for Dog Anxiety: Which One Fits Your Dog

On this page

1. What passionflower actually does
2. What valerian root actually does — and where it gets riskier
3. Where this leaves most owners
4. The threshold that actually matters

Start here: if your dog gets anxious around thunder, travel, or fireworks but doesn’t need heavy sedation, passionflower is the safer first step. If your dog needs stronger sedative support for something like a vet visit or a genuinely rough night, valerian root is the harder tool — but it comes with real cautions your vet should weigh in on first.

That’s the fork. Now the reasoning behind it.

Do this first: separate “anxious” from “needs an exam.” Pacing before a storm, shaking under the desk when the suitcase comes out, refusing the car — these are common, situational responses. A dog that’s anxious constantly, that’s stopped eating, or that’s showing new aggression is a different case, and no herb — passionflower, valerian, or otherwise — is the answer. That dog needs to be examined before you reach for any calming chew.

In my practice, I saw a 4-year-old Cavalier King Charles Spaniel named Otis, brought in on a Tuesday afternoon because his owner was dreading the coming holiday weekend. Otis weighed about 18 pounds, and every year around early July he started pacing the kitchen the moment the neighbor’s kids set off the first firecracker two blocks away — usually around dusk. His owner had tried a valerian-based chew the year before and found him groggy well into the next morning, stumbling slightly on the stairs. We talked through what she was actually optimizing for: she didn’t need him sedated for eight hours, she needed him settled for the two or three hours fireworks were loudest. That’s a passionflower problem, not a valerian problem, and it’s the distinction that changes what you buy.

What passionflower actually does

Passionflower’s anxiolytic effect is mediated through the GABA system — extracts have been shown to elicit GABA currents and interact with GABA receptors, which is the same general pathway targeted by prescription anti-anxiety medications, just at a much gentler intensity (National Center for Biotechnology Information (NCBI): Passiflora incarnata in Neuropsychiatric Disorders — A Systematic Review). That’s the mechanistic reason it tends to calm without knocking a dog out: it’s nudging the same system a sedative hits, not flooding it.

Chamomile shares some of this same traditional-use territory in dogs. For chamomile specifically, “evidence is derived mainly from preclinical studies or traditional use,” which is an honest way to frame most of the herbal calming category — helpful signal, not the same evidence tier as a drug trial (DOI.3390/biomedicines14051019).

What valerian root actually does — and where it gets riskier

Valerian works differently: it’s best known for genuinely sedating effects, and researchers have proposed it increases GABA activity in the brain, affecting the nerve transmissions tied to calm and sleepiness, according to PetMD. That’s a stronger lever than passionflower pulls, which is exactly why it can help with harder cases — and exactly why it needs more caution.

Two things I flag for owners every time valerian comes up. First, evidence in dogs specifically is thin; PetMD notes that valerian’s effects in humans remain inconclusive and studies in dogs are essentially nonexistent, so it should be used carefully even though it’s probably reasonably safe. Second, valerian shouldn’t be paired with sedative or anesthetic drugs, and it’s not appropriate for puppies or pregnant dogs — timing around any planned procedure matters, and that’s a conversation for your vet, not a chew label.

Where this leaves most owners

For the everyday version of this problem — thunder, the Fourth of July, a car ride, the suitcase coming out — I lean toward formulas built around the gentler end of the spectrum, layered with a few complementary actives rather than valerian alone at a high dose. This is where Boops Pets Calming & Stress Relief earns the recommendation I give most often. It combines KSM-66 Ashwagandha and L-theanine with a modest 30 mg of valerian root and 30 mg of chamomile per serving, rather than relying on valerian as the sole active. Ashwagandha has been shown in a systematic review of multiple RCTs to have a moderate positive impact on stress reduction (DOI.7759/cureus.96183), and L-theanine has been studied for its calming properties as an amino acid found in tea (Boops Pets vet-reviewed claim list). The formula also carries the NASC Quality Seal, meaning it comes from a NASC Primary Supplier Member facility — that’s an independently audited manufacturing standard, not a claim about outcomes.

I want to be direct about the honest tradeoff: if a dog needs stronger, more valerian-forward sedation for something specific — a grooming appointment, a flight — a valerian-heavier product may do more in the moment than a lighter blended chew will. That’s a real edge valerian holds, and I won’t pretend otherwise. But for the day-to-day anxiety most owners are actually managing, the blended, lower-valerian approach is the one I reach for first, because it doesn’t leave a dog groggy the next morning the way Otis was.

This is situational calming support — for the storm, the trip, the fireworks — not a treatment for an anxiety disorder, and pairing the chew with a predictable wind-down routine does as much work as the ingredient itself.

Near the end of that appointment, Otis’s owner asked the question I get more than any other: how do you know when it’s not just fireworks anymore? I told her what I tell most owners — track the pattern. If the pacing only shows up around the trigger and settles within an hour or two after, that’s the normal range calming support is built for. If it’s spreading into ordinary days, disrupting sleep for a week straight, or coming with a change in appetite, that’s not a chew question anymore. We scheduled a follow-up for two weeks after the holiday, not because I expected a problem, but because that’s the kind of thing worth checking rather than assuming. She left with the passionflower-forward option, and by the next visit, Otis was pacing less and settling faster after dusk.

The threshold that actually matters

Passionflower and valerian root aren’t competing for the same job. Passionflower is the everyday tool for common, situational anxiety. Valerian is the stronger lever for a harder moment, used with real caution around timing, dose, and any sedative your dog might also be on. If you’re not sure which category your dog falls into, that uncertainty is itself useful information — bring it to your vet rather than guessing with a stronger herb than you need.

If you’re the kind of owner who reads clinical nuance for its own sake, it’s worth spending time with What Vet School Does Not Teach You About the Emotional Swings of Veterinary Life, which gets at how much of this work is judgment calls, not formulas.

So: does your dog’s anxiety spike and settle with the trigger, or is it becoming the baseline?

Frequently asked questions

Can I give my dog passionflower and valerian root together?

Ask your vet first. Combining two GABA-active herbs increases the chance of oversedation, especially in small dogs, and valerian already carries interaction cautions around other sedatives.

Is valerian root safe for puppies?

No. Valerian root is not recommended for puppies, pregnant or lactating dogs, or dogs on other sedative or anesthetic medications.

How do I know if my dog's anxiety needs more than a calming chew?

If the anxiety is constant rather than tied to a specific trigger, or comes with appetite changes, new aggression, or disrupted sleep over multiple days, schedule an exam instead of adjusting the supplement.

Sources

1. Passiflora incarnata in Neuropsychiatric Disorders — A Systematic Review — National Center for Biotechnology Information (NCBI)
2. Valerian Root for Dogs: Does It Work? — PetMD
3. NASC Primary Supplier Member — Boops Pets — National Animal Supplement Council (NASC)