Dog Car Sickness: Causes, Prevention & Treatment

By Sarah Bennett, Certified Animal Nutritionist

Why Dogs Get Car Sick

Car sickness in dogs has two distinct root causes that often overlap: vestibular dysfunction and anxiety. Understanding which is driving your dog's symptoms helps you choose the right intervention.

The vestibular system — located in the inner ear — processes movement and balance. In cars, the visual input (scenery moving past the windows) conflicts with what the inner ear is sensing, particularly if a dog is facing sideways or cannot see out of the window. This sensory mismatch triggers nausea in the same way it does in humans prone to seasickness. Puppies are especially vulnerable because the inner ear structures involved in balance are not fully developed until around five months of age, which is why many dogs grow out of car sickness as they mature.

Anxiety is the second driver. For many dogs, car travel is associated exclusively with stressful destinations — the vet clinic, the groomer. The moment your dog hears car keys jingle or sees you approach the vehicle, the stress response activates. Stress hormones contribute directly to nausea, creating a self-reinforcing cycle: the car makes them anxious, anxiety makes them nauseous, and nausea makes the car more aversive.

Recognising the Signs

Car sickness in dogs does not always look like vomiting. Watch for these early warning signs, which typically appear before actual vomiting occurs:

• Excessive yawning or lip-licking
• Drooling more than usual
• Whining or vocalising
• Panting when the car is not hot
• Trembling or shaking
• Restlessness — inability to settle in one position
• Vomiting (the most obvious sign, but often the last to appear)

Prevention: Practical Steps Before You Drive

Fasting Before Travel

Travelling on a full stomach significantly increases the risk of vomiting. Withhold food for three to four hours before any car journey. Water can remain available until shortly before departure, but avoid large drinks immediately before travel. Do not fast puppies under 12 weeks for more than two hours without veterinary guidance.

Ventilation and Temperature

A hot, stuffy car dramatically worsens nausea. Keep the car well ventilated — crack windows on both sides to create airflow. The ideal car temperature for travelling dogs is around 18–21°C (65–70°F). Avoid driving with the heating on full, even in guide" title="Winter Dog Care: Cold Weather Safety for Every Breed">winter.

Position in the Car

Dogs that face forward experience less motion sickness than those facing sideways or backwards. A secured crate or crash-tested harness in the back seat — positioned so your dog can see through the front windscreen — is ideal. Dogs in the boot of an estate car often face backwards relative to travel direction, which worsens vestibular conflict. Raising smaller dogs so they can see out of the side windows also helps.

Frequent Stops

For journeys over an hour, plan a stop every 45–60 minutes. Allow your dog to walk around, sniff, and urinate. Fresh air and movement help reset the vestibular system and reduce accumulated stress.

Behavioural Conditioning for Car Anxiety

If anxiety is a significant component of your dog's car sickness, desensitisation and counter-conditioning are the most evidence-based long-term solutions. This process takes time — typically two to six weeks of consistent practice — but can eliminate travel anxiety permanently.

1. Week 1 — Near the car: Feed your dog treats near the parked, stationary car. No pressure to get in. Repeat daily.
2. Week 2 — In the car, engine off: Encourage your dog to sit in the car with the engine off. Give high-value treats. Keep sessions short (five minutes). Make it a positive event every time.
3. Week 3 — Engine on, not moving: Let the engine run while your dog sits calmly inside. Continue treating and praising relaxed behaviour.
4. Week 4 — Short drives: Begin with extremely short trips — literally around the block — that end somewhere positive: the park, a friend's garden, anywhere that is not the vet.
5. Gradually extend: Increase trip duration slowly, always ending on a positive note.

The AKC's guide to dog motion sickness and the AVMA's pet travel resources both provide additional strategies endorsed by veterinary professionals.

Veterinary Treatments

Cerenia (Maropitant)

Cerenia is currently the only FDA-approved medication specifically for preventing vomiting due to motion sickness in dogs. It works by blocking neurokinin-1 receptors in the vomiting centre of the brain. Cerenia is given as a tablet two hours before travel and is effective for up to 24 hours. It does not sedate your dog. It is available by prescription only — ask your vet if your dog's motion sickness is severe.

Ginger

Ginger has well-documented anti-nausea properties in both humans and animals. Studies suggest ginger root can reduce vomiting frequency in dogs with mild to moderate motion sickness. You can give small dogs a quarter teaspoon of fresh grated ginger or a commercially produced ginger dog treat about 30 minutes before travel. Always check with your vet regarding appropriate dosing for your dog's weight.

Prescription Anxiolytics

For dogs whose car sickness is primarily anxiety-driven, your vet may prescribe medications such as trazodone, alprazolam, or gabapentin to be given before travel. These should be combined with behavioural conditioning rather than used as a standalone solution.

What Not to Do

• Do not give human antihistamines (such as Dramamine) without veterinary guidance — some formulations contain xylitol or other ingredients toxic-to-dogs" title="toxic-to-dogs" title="Is Sago Palm Toxic to Dogs?">Is Sago Palm Toxic to Dogs?">toxic-to-dogs" title="Is Aloe Vera Toxic to Dogs?">toxic to dogs.
• Do not punish a dog for vomiting in the car — this increases anxiety and worsens the problem.
• Do not cover your dog's crate with a blanket if the car is warm — overheating is a significant risk.