A 20kg dog in a 30mph crash exerts a force of roughly half a tonne. That number is the whole argument for restraint: it is not about the dog jumping into the front seat, it is about what happens to everyone in the car when physics gets involved.
The restraint options, ranked
A crash-tested travel crate, secured in the boot. The safest option by a clear margin, in independent crash testing. Look for a manufacturer that publishes actual crash test results — many claim safety, few test it. The crate must be anchored; an unsecured crate is itself a projectile.
A crash-tested harness with a short tether to a seatbelt anchor. The best option in a car without a suitable boot. Again, the phrase to look for is independently crash tested, at the relevant standard.
A boot with a rigid dog guard. Prevents a dog entering the cabin, which is worthwhile, but does nothing to protect the dog in a frontal impact.
Booster seats for small dogs. Mostly containment rather than protection, unless specifically crash tested.
What not to use: an ordinary walking harness clipped to a seatbelt. These are not built for crash forces and can cause severe injury by concentrating load through the neck or chest.
In the UK, the Highway Code requires dogs to be suitably restrained, and an unrestrained pet can invalidate insurance and support a careless driving charge. Similar rules apply in many other countries.
Travel sickness
Two distinct problems that look alike.
True motion sickness is most common in puppies and often outgrown — the structures of the inner ear are still maturing. Signs: drooling, lip licking, yawning, restlessness, then vomiting.
Travel anxiety produces identical signs, because nausea is part of the stress response. The tell is context: a dog who drools and pants in a stationary car has a fear problem, not a balance problem.
Many dogs have both. The car often starts as motion sickness and becomes anxiety once a dog has been sick in it a few times.
Fixing anxiety-based sickness
The protocol is desensitisation, and it is worth the fortnight it takes:
- Feed meals beside the parked car for several days
- Sit in the stationary car with the engine off, doing nothing interesting, with good food. Five minutes, then out
- Engine on, not moving. Feed, turn it off, get out
- Drive to the end of the road and back. Get out, do something enjoyable
- Build up in small increments, and make sure the majority of journeys end somewhere good — a field, a walk, a friend’s house. Not only at the vet’s
The core problem for most car-anxious dogs is that every journey ends somewhere they dislike. Fix the ratio and much of the anxiety fades.
Practical measures
- Travel on an empty-ish stomach: a light meal three to four hours before, not immediately before
- Face the dog forwards if possible
- Keep the car cool and let in fresh air
- Lower the windows an inch to equalise pressure
- Drive smoothly — braking and cornering matter more than speed
- Take a break every two hours on long trips
Veterinary anti-sickness medication exists and works well. Maropitant is specifically licensed for travel sickness in dogs and prevents vomiting in the large majority of cases. Sedatives are a separate question — some reduce the outward signs while leaving the dog just as frightened, so discuss which is appropriate.
Heat: the rule with no exceptions
Never leave a dog in a parked car, even briefly, even in the shade, even with windows cracked.
On a 22°C day the interior of a car can exceed 47°C within an hour, and most of that rise happens in the first fifteen minutes. Dogs cool almost entirely by panting, which fails once the air is hot and humid.
Heatstroke in dogs carries a high mortality rate and can develop within minutes. “Just five minutes” is how most cases begin.
If you see a dog in distress in a locked car, call the police. Signs of trouble: heavy frantic panting, drooling, bright red or blue-tinged gums, vomiting, staggering, collapse.
Long journeys
- Stop every two to three hours for a toilet break, water and a short leg stretch on a lead
- Carry water and a collapsible bowl. Offer small amounts often rather than a lot at once
- Never open a door without a lead attached. Motorway services are where dogs are lost
- Bring their own bed or blanket — familiar scent settles a dog considerably
- Check the ID tag and microchip details before a trip. An out-of-date phone number is the most common reason a found dog is not returned
- Consider a temporary tag with your destination address for holidays
Puppies and the first journeys
The first few car trips shape the next fifteen years. Make them short, positive, and frequent, and do not let the first three journeys be to the vet for vaccinations.
Someone sitting beside the crate for the first trips helps enormously, and so does going somewhere genuinely fun at the other end.
