Why doesn't Eurostar allow pets?
The restriction is a safety and Channel Tunnel sanitation rule, not a commercial choice. Under the bilateral agreement governing the Channel Tunnel, the only animals authorised to cross by passenger train are registered assistance dogs and animals being transported by Eurotunnel's vehicle service (Le Shuttle).
This rule has been in place since the Tunnel opened in 1994 and has not changed under any of Eurostar's ownership transitions. Brexit didn't affect it; the upcoming open-access competition from new cross-Channel rail operators won't either, because the constraint comes from the Tunnel concession itself.
Eurostar staff cannot grant exceptions even for emotional support animals — UK and EU rail law treats them as pets, not assistance animals. Only certified assistance dogs (guide dogs, hearing dogs, medical alert dogs) registered with an Assistance Dogs International member organisation may travel.
Alternative #1 — Le Shuttle (Channel Tunnel by car)
Le Shuttle (operated by Eurotunnel/Getlink) is the most popular and reliable option for travellers with pets. You drive your car directly onto a train carriage, and your pet stays with you in the vehicle for the 35-minute Tunnel crossing — no cargo hold, no separation, no stress.
The pet supplement is £22 / €27 each way per pet. There is no size or breed restriction (though banned dangerous breeds under UK law cannot enter the UK at all). Up to 5 pets per vehicle. Booking happens at the regular Le Shuttle reservation step.
Practical tip: pets must remain inside the vehicle during the crossing. You stay with them. There's a designated dog walking area at both Folkestone and Calais terminals — use it before and after the crossing for relief.
Alternative #2 — Cross-Channel ferries (Dover–Calais, Portsmouth–Caen, etc.)
P&O Ferries, DFDS and Brittany Ferries operate the main car-ferry routes between the UK and France/Spain/Netherlands. Pets are accepted on every route, generally for £20-£40 each way (pricing varies by operator and route).
Most ferries require pets to remain in the vehicle on car decks during the crossing — owners typically check on them mid-crossing (announcements indicate when this is permitted). On longer overnight routes (Portsmouth–Bilbao, Hull–Rotterdam), some ships offer "pet-friendly cabins" with direct access — book these well in advance.
If you're foot passengers (no car), only specific routes accept pets: Brittany Ferries Plymouth–Roscoff allows foot passengers with pets in a dedicated kennel area. Most other lines require a vehicle.
Alternative #3 — Short flights (London–Paris, London–Brussels, London–Amsterdam)
British Airways, Air France and KLM accept dogs in the cabin (under 8 kg in carrier) on routes to/from London City and Heathrow. Larger dogs travel as IATA-compliant cargo (in-hold transport, climate-controlled).
Cabin fee: typically £100-£150 per pet, each way. Cargo: £300-£500 each way for medium dogs, more for large breeds. Brachycephalic breeds (Bulldogs, Pugs, Persian cats) are banned by most airlines on summer routes and on routes that include short stopovers.
In practice, flights are slower than Le Shuttle once you factor in 2h check-in, security, immigration and baggage retrieval. The Tunnel is door-to-door faster for the London-Paris/Brussels/Amsterdam range, and far less stressful for the dog.
Our practical recommendation
For 95% of travellers between the UK and continental Europe, Le Shuttle is the right choice: cheapest pet supplement, fastest crossing, dog stays with you the entire time, no separation. Book a daytime crossing and be at the terminal 30 minutes before departure.
Ferries are a viable alternative if you don't want to drive through Folkestone (e.g. coming from Yorkshire, Scotland or Wales) or if you want to extend the trip with a Spain/Netherlands ferry rather than driving through France.
Flights are only sensible for very small dogs in cabin on long-distance routes (London-Madrid, London-Rome) where Le Shuttle would mean two days of driving. For anything within Le Shuttle's reach, the Tunnel wins on every metric.