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

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

Comparisons · August 5, 2026 · 6 min read

Ginger works on the gut and the vomiting reflex; chamomile works on the nervous dog riding in the back seat.

A twelve-week-old Cavalier puppy named Biscuit taught me more about car sickness than any textbook did. His owners brought him in because every ride to the dog park ended the same way — hypersalivation by the second stoplight, then vomiting before they’d gone two miles. He was small enough that dehydration from repeated vomiting was a real concern, not a theoretical one. What struck me wasn’t the vomiting itself. It was how much of his distress showed up first as behavior — panting, whining, refusing to settle — before the gut symptoms caught up. That sequence is the whole reason owners keep asking me whether ginger or chamomile is the “right” choice, as if it’s one problem with one fix. It usually isn’t.

Car sickness in dogs is a mix of two overlapping systems: the vestibular-triggered vomiting reflex, and the anxiety that builds around a ride the dog has learned to dread. Ginger and chamomile are marketed as interchangeable “natural motion sickness” ingredients, but they don’t act on the same system, and they don’t have the same evidence behind them. Read the label and the underlying research before you decide which one — or whether both — fits your dog.

What’s actually happening physiologically in the car

Vomiting is coordinated by the chemoreceptor trigger zone and the vomiting center in the brainstem, which receive input from the vestibular apparatus in the inner ear when a dog’s sense of balance is thrown off by motion it can’t predict. Puppies are disproportionately affected because the vestibular system isn’t fully mature, which is part of why many dogs “outgrow” true motion sickness by twelve months even as learned anxiety about the car can persist. This distinction — a puppy who is genuinely motion sick and an adult dog who has associated the car with something bad — is where owners waste the most money on the wrong ingredient. If your dog vomits every time it goes for a car ride, understanding which mechanism is driving it changes what’s worth trying first, a distinction covered in more depth in Why Your Dog Vomits Every Time You Go for a Car Ride.

Ginger: the antiemetic case

Ginger’s active compounds, gingerols and shogaols, have documented effects on gastrointestinal motility and on the same nausea pathways implicated in motion sickness. According to Ginger: Usefulness and Safety: NCCIH, the human evidence is mixed depending on the cause of nausea — it’s uncertain whether ginger meaningfully helps nausea from chemotherapy or from surgery, but the mechanism for motion-related nausea is more consistent across the literature than it is for those other categories. NCCIH also flags a real safety consideration that matters for dogs on other medications: ginger can have mild gastrointestinal side effects and has documented interactions with blood-thinning drugs, so it isn’t a blanket “safe for every dog” ingredient, particularly for older dogs on NSAIDs or anticoagulants.

For a dog whose primary problem is the vestibular-triggered vomiting reflex itself — drooling, retching, vomiting with no clear behavioral buildup — ginger is targeting the right system. That’s a meaningfully different claim than saying it calms the dog.

Chamomile: the anxiolytic case, and its gaps

Chamomile’s relevant compound is apigenin, which has affinity for GABA receptors in a way that plausibly explains a calming effect. But the evidence base here is thinner and more indirect than owners assume. Chamomile: Usefulness and Safety: NCCIH states plainly that studies of chamomile’s effectiveness across a range of conditions “have not produced sufficient reliable evidence to rate clinical usefulness,” though some preliminary human studies suggest a benefit for generalized anxiety. Almost none of that evidence was generated in dogs. What chamomile has going for it is a long safety record and a genuinely plausible mechanism — not a demonstrated antiemetic effect.

That matters because if a dog’s car sickness is driven mostly by anticipatory anxiety rather than the vestibular reflex, chamomile is aimed at the right target even without dog-specific trials to back the dose or the claim. If the dog’s problem is the vomiting reflex itself, chamomile isn’t built to touch it. The comparison between chamomile and l-tryptophan for calming, covered separately in Chamomile vs L-Tryptophan for Calming Dogs, goes deeper into how chamomile performs against other calming ingredients specifically, which is a different question than how it performs against ginger for nausea.

How I actually sort this out for a specific dog

In my practice, the history does most of the diagnostic work before I ever discuss an ingredient. I ask owners three things: when in the ride does it start, what does the dog look like right before it happens, and has this dog ever had a good car ride. A dog who drools and vomits within the first mile regardless of how calm the ride is, every single time, is telling you something different than a dog who’s fine on short trips to the park but shakes and refuses to load into the car before a vet visit. One of the dogs I worked with, a seven-year-old Australian Shepherd named Dash, only had trouble on the specific route to the groomer — never anywhere else. That’s not a vestibular problem; the car itself wasn’t the trigger, a learned association was. No amount of ginger was going to fix that, and it didn’t need to. The owners worked on desensitization and used a calming approach for the anticipatory piece, and the vomiting on that specific route resolved over about six weeks without ever touching the gut side of things. Puppies with true, mechanism-driven motion sickness are a different conversation entirely, and I treat them differently.

The mistake I see most often is owners trying one ingredient, deciding it “didn’t work,” and abandoning the whole natural-remedy category rather than asking whether they picked the ingredient for the mechanism their own dog actually has.

Bloodwork and label questions before you start either one

Neither ginger nor chamomile requires bloodwork to use safely in a healthy adult dog, but a few label and history questions matter more than owners expect. Is the dog on an NSAID, an anticoagulant, or has it had any bleeding-related diagnosis — if so, ginger needs a veterinary conversation first given the interaction NCCIH documents. Is this a young puppy whose motion sickness may resolve with vestibular maturity on its own timeline, in which case symptomatic management matters more than a permanent supplement plan. And practically: read what’s actually on the label. Many combination calming chews list chamomile as one ingredient among many with no disclosed dose, which makes it impossible to know whether the amount present is anywhere near what the preliminary human trials used.

The verdict

Ginger and chamomile are solving different problems, and the honest answer to “which one” is “which mechanism does your dog actually have.” A dog with a clear vestibular vomiting pattern — vomiting on nearly every ride regardless of mood, often a puppy — is better served starting with ginger, understanding that the human evidence for motion-specific nausea is more favorable than for other nausea causes, and watching for the drug interactions NCCIH flags. A dog whose car sickness tracks with dread, past bad experiences, or specific routes is better served by addressing the anxiety directly, where chamomile has a plausible mechanism but a real evidence gap in dogs specifically. Owners whose dogs show both patterns — which is common — often end up needing both approaches, plus behavioral desensitization, rather than a single ingredient doing all the work. Whichever one you start with, give it a fair trial across several rides before switching, because a single bad car ride doesn’t tell you as much as a pattern does.