Ginger Versus Chamomile for Dog Car Sickness: What the Evidence Actually Supports

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

Comparisons · August 14, 2026 · 6 min read

Ginger has a real dog-specific antiemetic trial behind it; chamomile has a plausible calming mechanism and almost no data run in dogs.

The first time I saw it laid out in front of me on a treatment table, it was a nine-year-old Cavalier King Charles Spaniel named Biscuit, thirty minutes into a two-hour drive to a dog show, drooling in long ropes onto the towel his owner had learned to bring. He wasn’t panting from heat — it was October, sixty degrees, windows cracked. His owner had tried a chamomile calming chew from the pet store the week before, and it hadn’t touched the drooling or the vomiting that came twenty minutes later. That’s a pattern I’ve watched play out with a fair number of owners: they reach for the “calming” aisle first because their dog looks anxious, when what’s actually happening is a vestibular signal telling the brainstem’s vomiting center to fire. Treating the anxiety without touching the reflex is why the chew doesn’t work, and why the question of ginger versus chamomile deserves an actual mechanism-first answer instead of a shelf-tag one.

What’s actually happening in a carsick dog’s body

Motion sickness starts in the inner ear, not the stomach. Mismatched signals between the vestibular apparatus, the eyes, and proprioceptive input reach the brainstem’s chemoreceptor trigger zone and vomiting center, and that’s what produces the drooling, lip-smacking, and eventual vomiting — the anxiety a dog shows on a car ride is frequently a learned response to having felt sick before, layered on top of the reflex, not the sole cause of it. Today’s Veterinary Nurse frames motion sickness in dogs this way: a primarily vestibular and gastrointestinal event, most common in puppies whose vestibular systems are still maturing, that often resolves somewhat with repeated, gradual exposure. That distinction between the reflex and the anxiety around it is the whole reason ginger and chamomile aren’t interchangeable, even though they end up in the same “calming” section of a supplement aisle.

Ginger: the antiemetic with dog-specific data behind it

Ginger’s gingerols and shogaols act at the gut and at the chemoreceptor trigger zone with antiemetic effects that have been studied specifically in dogs, not just extrapolated from human trials. A study published in the Journal of Ethnopharmacology evaluated ginger’s antiemetic efficacy against cisplatin-induced emesis in dogs — a different trigger than motion sickness, but the same downstream vomiting pathway ginger is being asked to interrupt, and the kind of controlled canine data that’s genuinely rare in this category. VCA Animal Hospitals also lists ginger among the botanicals with some evidence for reducing nausea and vomiting in dogs, while noting that dosing and product quality vary considerably between supplements sold for pets. That’s the analyte I actually care about on a label: not whether “ginger” appears in the ingredient list, but whether the product discloses a gingerol content anywhere close to what was studied. Most don’t.

I read labels the way I read a chemistry panel — the number on the front of the bag tells you almost nothing until you know what’s actually being measured underneath it.

Chamomile: a real calming mechanism, a much thinner evidence file

Chamomile’s apigenin is a documented, mild benzodiazepine-receptor ligand, and that’s not junk pharmacology — it’s a real, plausible reason a nervous dog might settle down with it on board. What it isn’t is an antiemetic. I haven’t found a controlled canine trial testing chamomile against vomiting or nausea specifically, only mechanistic and behavioral work in other species and general veterinary commentary on its calming use. That gap matters clinically: if a dog’s problem is the vomiting reflex itself, a product built to quiet the nervous system around it can leave the underlying trigger completely untouched, which is exactly what happened with Biscuit’s chew. Where chamomile earns its place is in the layered picture — a dog who’s anxious about the car because of past sickness may benefit from something calming alongside an antiemetic strategy, the same way I’ll pair a mobility plan with pain control rather than expecting one ingredient to do both jobs. Owners weighing this exact tradeoff — a genuinely calming ingredient for a nervous rider versus one built to interrupt vomiting — are covered in more depth in our Chamomile vs L-Tryptophan for Calming Dogs piece, since the calming half of this comparison deserves its own workup.

The counterargument I take seriously

The strongest case for chamomile-forward products is that anxiety and nausea reinforce each other in a feedback loop — a dog who dreads the car gets more stressed, and stress itself can worsen GI upset, so calming the nervous system first isn’t nothing. I don’t dismiss that. But I still land on ginger as the first-line ingredient to look for on a car-sickness label, because the trial data ties directly to the vomiting reflex the owner is actually trying to stop, and because a calmer-but-still-vomiting dog is not the outcome anyone drove to the vet asking about.

Why the label matters as much as the ingredient

None of this evidence means much if the product on the shelf doesn’t contain what the label claims. I tell owners to look for the NASC Quality Seal before anything else — the National Animal Supplement Council audits member facilities and runs random product testing to confirm labels match contents, though as the organization itself is clear about, the seal certifies process and label accuracy, not that the ingredient will work for your dog’s specific problem. That’s the bloodwork-before-the-marketing step I’d apply to any supplement claim: a NASC seal tells you the gingerol content on the label is probably real; it doesn’t tell you your dog’s motion sickness is vestibular versus anxiety-driven, or dosed correctly for a fourteen-pound terrier versus a seventy-pound Labrador.

There’s a dog I still think about from a few years back — a fifteen-month-old Border Collie mix, forty-two pounds, whose owner worked a job that meant a forty-minute commute with the dog riding along most weekday mornings. He’d vomit almost every trip, usually within the first ten minutes, always on an empty stomach because the owner had read somewhere that food made it worse. We tried withholding food for exactly the wrong reason — an empty stomach can make nausea worse in some dogs, not better — and once we adjusted the timing of a small meal and added a ginger-based product with a disclosed gingerol dose, the vomiting dropped off within about two weeks of consistent rides. I’m not presenting that as a study result; it’s one case, and every dog’s trigger is a little different. But it’s the pattern I’ve seen often enough to trust the mechanism over the marketing.

Where this leaves an owner standing in the pet store aisle

If your dog’s main symptom is vomiting or heavy drooling that resolves once the car stops, start with the ingredient that has dog-specific antiemetic data — ginger, at a disclosed and adequate dose, ideally from a NASC-listed product. If the dominant symptom is trembling, whining, or reluctance to get in the car with little or no vomiting, a calming approach built around chamomile or a comparable ingredient makes more physiological sense, and it’s worth reading our breakdown on Prescription vs Over-the-Counter Dog Probiotics for a template on how we evaluate label claims generally, since the same label-literacy applies here. And for dogs where both are in play — which, honestly, is most of the carsick dogs I see — a vet-guided combination, or a prescription antiemetic like maropitant for dogs who don’t respond to either, is a reasonable next step rather than cycling through supplement brands on faith.