Why Does My Dog Tremble When Riding in the Car? — Step-by-Step Desensitization Training for Motion Sickness and Phobia

Brain & CognitionQ&AMeongsiljang Veterinary Advisory Board

If your dog or cat is afraid of car rides or frequently experiences motion sickness, you can reduce their stress response through gradual desensitization and counterconditioning. Here’s a summary of the training steps and when to consult your veterinarian.

What Is Car Phobia?

Canine and feline car phobia is a behavioral issue characterized by recurring stress responses—such as tension, vomiting, and trembling—during car rides. The key to management lies in gradual desensitization and counter-conditioning. Forcing your pet into the car or moving them around can actually intensify their fear. The core of training is to slowly transform the car from a "scary place" into a "space where good things happen."

Is It Motion Sickness or Phobia?

Car anxiety in dogs generally stems from two main causes: - Physical motion sickness: The vestibular system struggles to adapt to the car’s movement, leading to drooling and vomiting. This is especially common in dogs with limited or unfamiliar car travel experience. - Psychological fear: Negative past experiences—such as vet visits, separations, or accidents—become associated with the car, triggering anxiety, trembling, and barking. Often, both factors overlap. Identifying the underlying cause is essential, as it determines whether training or medication should be prioritized.

Comparing Symptoms of Motion Sickness vs. Phobia

Item	Physical Motion Sickness	Psychological Fear
Main Symptoms	Drooling, vomiting, diarrhea	Trembling, barking, hyperventilation
Onset	During or after driving	Even before boarding
Age	Individuals with little travel experience	Regardless of age
Improvement Method	Motion sickness medication + gradual exposure	Desensitization + counterconditioning
Accompanying Symptoms	Body goes limp	Hiding, aggression

The two types often appear together

Step-by-Step Desensitization Training

Desensitization is a training method that gradually exposes your pet to stimuli in small, manageable increments to help them become comfortable over time. - Step 1: Create positive associations by offering treats and play near the car. - Step 2: Have your pet enter the car with the engine off and reward them with treats. - Step 3: Start the engine but keep the car stationary. - Step 4: Take a short drive of 1–2 minutes and return home. - Step 5: Gradually increase driving time, ending at enjoyable destinations like parks or walking areas. Repeat each step until your pet feels relaxed and comfortable before moving on.

A puppy being trained with treats next to a parked car

Stop Immediately If You See These Signs!

If you notice any of the following signs during training, immediately reduce the intensity and do not proceed until your pet is fully comfortable at that level: excessive drooling, repeated vomiting or diarrhea, persistent whole-body trembling, continuous panting or difficulty breathing, unrelenting barking or howling, or aggressive attempts to bite your hands. If these symptoms recur, behavioral training alone is unlikely to resolve the issue, and consultation with a veterinary behavior specialist is necessary.

Creating "Car = Good Things" Through Counterconditioning

Counterconditioning is a training method that helps your dog develop a new, positive association with the car, essentially teaching them that "car equals good things." The key is to offer a special treat—something high-value that you don't usually give—only when they are in the car. Connect these treats and praise with specific moments: when they get in, when the engine starts, and when the ride ends. Keep in mind that if your dog is already showing signs of fear, they may refuse even their favorite treats. Therefore, it's crucial to follow the process of giving treats only when they are calm and comfortable. Veterinary behavior experts suggest that consistently implementing desensitization and counterconditioning programs can effectively reduce your dog's fear of car rides and vet visits.

When to Use Medications and Supplements

When desensitization alone isn’t enough, veterinarians often prescribe medications or supplements alongside it. For nausea and vomiting caused by motion sickness, antiemetics like maropitant (Cerenia) can help when given at least two hours before travel. Antihistamines such as dimenhydrinate and diphenhydramine are also used to prevent motion sickness in dogs. If fear or anxiety is severe, anti-anxiety medications may be added; these can be used short-term for specific situations or long-term for chronic issues. Your veterinarian will determine the appropriate dosage and schedule based on your dog’s weight and overall health. Never give human motion sickness or sedative medications to your pet without veterinary guidance.

How to Approach Car Phobia in Cats

Approaching car anxiety in cats differs from dogs. Cats tend to fear unfamiliar spaces more intensely, so acclimating them to the carrier comes first. Leave the carrier open in your home and make it a safe, inviting spot with treats and a cushion. Spraying a facial pheromone product (Feliway) inside and around the carrier at least 15 minutes before departure can help reduce anxiety. During the car ride, covering the carrier with a towel blocks their view and minimizes external stimuli.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

How long does it take for training results to become noticeable?

Individual differences vary widely, and consistent, step-by-step training typically takes several weeks to months. Rushing through the stages can actually intensify fear.

Won’t they get used to it if we force them to go outside more often?

Even if your pet appears to be getting used to something, it may actually be suppressing its fear response or experiencing a more severe escalation of stress. If calming signals are ignored, this can ultimately lead to increased aggression or heightened anxiety. Positive, gradual exposure is essential.

Is it safe to give my pet motion sickness medication every time we travel?

Short-term use is safe, but long-term use should be determined by a veterinarian. If the underlying cause is fear, medication alone won’t resolve the issue.

Can I carry my pet in my arms without using a carrier?

We don’t recommend it for safety reasons. In the event of sudden braking or an accident, your child could be seriously injured. Instead, use a pet-specific safety harness or a secured carrier.

Can cats also undergo desensitization training?

Yes, it’s possible. However, it will take longer than with dogs, and you’ll need to proceed gradually, starting with acclimating your cat to the carrier and then slowly introducing them to the area near the car.

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References

[1] Stellato, A. et al., Effect of a standardized four-week desensitization and counter-conditioning training program on pre-existing veterinary fear in companion dogs, Animals 9(10):767, 2019

[2] Stellato, A.C. et al., Risk-factors associated with veterinary-related fear and aggression in owned domestic dogs, Applied Animal Behaviour Science 241:105374, 2021

[3] Korpivaara, M. et al., Dexmedetomidine oromucosal gel for noise-associated acute anxiety and fear in dogs — a randomised, double-blind, placebo-controlled clinical study, Veterinary Record 180(14):356, 2017

[4] Introduction to Animal Behavior and Veterinary Behavioral Medicine, Chapter 17