Different routes have different policies. Pets are not allowed on trains to and from London, between Brussels and Lille, or on Eurostar Sun and Snow routes. However, you can travel with a guide or assistance dog or cat, but you’ll need to contact the Eurostar worker at least 24 hours before your journey. Additionally, pets are welcome on all other routes between Belgium, France, Germany, and the Netherlands. However, there are some rules that need to be followed, such as dangerous dogs, wild animals, and birds (parrots, canaries, etc.) are not allowed on Eurostar trains.