Original10 mcg melatonin, 15 mg L-tryptophan, 50 mg chamomile, 25 mg thiamine per chew
- Dose by weight
- Up to 26 lb: 1 · 27–50 lb: 2 · 51–99 lb: 4 · 100+ lb: 6
- How to use
- As needed, 30 min before the stressor
HempSame actives as Original plus 75 mg hemp seed oil and 75 mg hemp seed powder (not CBD)
- Dose by weight
- Up to 26 lb: 1 · 27–50 lb: 2 · 51–99 lb: 4 · 100+ lb: 6
- How to use
- As needed, 30 min before the stressor
Calm + Probiotic1.5 mg melatonin, 30 mg L-theanine, 150 mg ashwagandha, 3 billion CFU per chew
- Dose by weight
- Up to 25 lb: 1 · 26–50 lb: 2 · 51–75 lb: 3 · 76–100 lb: 4
- How to use
- Daily, every day
From ThunderWorks labels (actives listed per 2 chews, shown here per chew). Ask your vet before giving Calm + Probiotic to small dogs, puppies, pregnant dogs or dogs on medication.
When to start and when to give the travel dose
ThunderBites Calm + Probiotic is a daily supplement, not a fast-acting sedative like some sprays or single-dose travel pills. The calming ingredients — ashwagandha, L-theanine, L-tryptophan, melatonin, thiamine (vitamin B1), plus chamomile — are designed to work with regular use, so start giving the chews consistently a week or two before a planned trip rather than for the first time on the morning you leave.
On travel day, give the usual daily dose with a light breakfast. If you would rather use a situational chew, the original ThunderBites Calming Chews (ginger, chamomile, passion flower, 10 mcg melatonin per chew) are labeled to be given 30 minutes before the stressful event: 1 chew up to 26 lb, 2 at 27 to 50 lb, 4 at 51 to 99 lb and 6 at 100 lb and up. Feeding a small meal (rather than a full one) can also help settle the stomach. The chews also include ginger, which is traditionally used to ease nausea, and a probiotic blend (3 billion CFU per chew; 6 billion per 2 chews) for gut health. Set realistic expectations: a calming chew nudges the edge off nervousness for many dogs, but it is a supplement, not a guaranteed fix.
Car anxiety vs. true motion sickness
These two problems look similar and often overlap, which is why one product rarely fixes everything. Telling them apart helps you choose the right approach.
| What you see | More likely anxiety | More likely motion sickness | What tends to help |
|---|---|---|---|
| When it starts | Before the car even moves | Once the car is moving | Setup + gradual practice |
| Main signs | Panting, trembling, pacing, whining, refusing to get in | Drooling, lip-licking, then vomiting | Calming support vs. anti-nausea |
| What ThunderBites can do | May help take the edge off the worry | Will not stop true motion-sickness vomiting | Ask the vet about Cerenia for vomiting |
If your dog is trembling and refusing the car before you even start the engine, you are mostly dealing with anxiety. If they seem fine getting in but start drooling and then vomit a few minutes down the road, that points to true motion sickness — and a calming chew alone will not stop it. Many dogs have a bit of both.
Related: -ThunderBites probiotic vs regular calming chews which better
Dosing by weight and common mistakes
Calm + Probiotic dosing follows the manufacturer's weight chart: 1 chew for dogs up to 25 lb, 2 chews for 26 to 50 lb, 3 chews for 51 to 75 lb, and 4 chews for 76 to 100 lb. The chews are labeled for dogs 12 weeks and older. The most common mistake is treating them like a one-off travel pill instead of a daily chew — skip too many days and you lose the steady buildup. The second is guessing the dose instead of following the weight chart. Because the formula contains melatonin (1.5 mg per Calm + Probiotic chew), more is not better; keep the jar out of reach so a dog cannot help themselves to a pile of chews, and check with your vet before combining with any other medication or supplement.
Related: -ThunderBites chews for small breed dogs with anxiety
Restraint, practice drives, and travel-day setup
Safety comes first, and a settled dog is usually a secured dog. Restrain your dog on every drive with a crash-tested harness clipped to a seatbelt, or a well-ventilated crate that is anchored so it cannot slide — an unrestrained dog can be injured or thrown in a hard stop and can distract the driver. Keep the car cool and well ventilated, and avoid a large meal right before you leave.
For a dog that dreads the car, short desensitization sessions do a lot of the heavy lifting that no chew can. Start with the engine off: reward your dog for hopping in, then for sitting calmly, then build up to the engine running, then a trip to the end of the block, then a short drive that ends somewhere good like a park. Keeping early rides brief and positive teaches the dog the car is not a threat, which pairs well with the calming support of a daily chew.
When to talk to your vet
See your vet if your dog vomits on trips despite the setup changes above, panics on every drive, or is a puppy, pregnant, nursing, or on other medication. For true motion-sickness vomiting, vets often prescribe maropitant (Cerenia), the medication approved to prevent it in dogs; it is typically given with a little food a couple of hours before travel. For dogs that are severely anxious as well as nauseous, a vet may discuss prescription anti-anxiety options as part of a plan. A calming chew can be one supportive piece, but persistent vomiting or panic is a conversation for your veterinarian, not a supplement to solve alone.