How to take your dog in the car safely and legally
Twenty kilos on the back seat is half a tonne
Most dogs love the car, and most owners let them ride the way the dog likes best: loose on the back seat, head between the front seats. It feels harmless at walking pace. In a crash or an emergency stop it is anything but, for the dog and for everyone in front of it. The good news is that the fix is cheap, quick and works in every car. Here is what crash tests show, where your dog belongs and what the police can fine you for.
The short version
A loose dog hits the seats, or you, with many times its own weight.
Best: a well-fitted crate in the boot, pushed against the rear bench and strapped down.
Fallback: a crash-tested harness on the rear seat, clipped short to Isofix or the belt.
Never on the front seat, never on a lap, never on just a collar.
What a loose dog does in a crash
The Swiss motoring club TCS crash-tested dogs at 50 km/h, a normal town speed. A 20 to 25 kg dog on the back seat flew forward with a force of around 500 kg: into the seat backs, into the heads of the people in front, or through the windscreen. The dog rarely survives that, and the passengers it hits can be badly hurt.
There is a second problem after the crash. A frightened, injured dog loose in the car can keep paramedics away from the people inside. And one that jumps out onto a motorway is a new accident waiting to happen.
Crate, harness or guard: what holds
Germany's ADAC tested every common system in hard braking and a swerve at 100 km/h. A crate that fits the dog came out as the safest choice, followed by harness systems that anchor to the Isofix points and stop the dog sliding forward or sideways. Tube-style carriers were rated completely unsuitable, and a barrier behind the front seats did little in a swerve. That swerve is exactly what an emergency stop can turn into.
Not every crate is strong enough, though. In a TCS test of nine boxes, published in December 2025, four failed: the rear walls shattered and the dummy dog ended up outside the box. The models rated excellent cost 449 to 787 euros, so a cheap plastic travel kennel is fine for the vet but not a crash restraint.
Why the front seat is off limits
The passenger airbag deploys at over 200 km/h, which is why a rear-facing child seat may only go there with the airbag switched off. A dog gets no such protection, and on the front seat it is also right next to your hands and the gear lever. Keep it in the boot or on the rear seat, and never on a lap, however small it is.
The rules differ by country
No EU law covers pets in cars, so every country sets its own. Germany treats an unsecured dog as unsecured load: 35 euros, 60 euros and a point if it creates danger, 75 euros and a point after a crash. France fines 35 euros when a dog hinders the driver. Spain can fine up to 200 euros when a loose dog restricts the driver. Italy allows one pet loose as long as it does not get in the way; two or more must travel in a crate or behind a net.
Belgium and the Netherlands have no dedicated rule. The driver simply has to stay in full control of the car, and an officer who sees a dog climbing onto the driver can fine you for that. Secure it and the question never comes up.
Before your next trip with the dog
Size the crate so the dog can sit, stand, turn and lie down, but no bigger. A smaller box stops it being thrown around.
Put the crate in the boot, tight against the rear bench, and lash it to the tie-down eyes.
On the rear seat, use a harness, never a collar, with the tether short enough that the dog cannot reach the footwell.
Check that the rear seat backs are fully latched; they hold the crate in a crash.
Keep the lead within reach, and clip it on before you open a door at the roadside.
Stop now and then on long drives, and never leave the dog in a parked car in the sun.
Frequently asked questions
Is it illegal to have a dog loose in the car?
In Germany, France and Spain you can be fined, and in Italy two or more loose pets are not allowed. Belgium and the Netherlands have no specific rule, but a dog that hinders the driver can still cost you a fine.
Can my dog ride on the front seat?
It is not a good idea anywhere. The passenger airbag is built for an adult, and a dog within reach of the driver is a distraction. The boot or the rear seat is the right place.
Is a harness as safe as a crate?
A crash-tested harness anchored to the Isofix points works well. Many cheaper harnesses tear or stretch too far in a crash, so look for one that has passed an independent test.
Where should the crate go?
In the boot, pushed against the back of the rear bench and strapped down, not loose on the floor or on the seat. Put a small dog's carrier in the rear footwell or belt it onto the rear seat.
