Before travelling, always ask a particular carrier about the conditions of transport of the guide dog and for foreign travel also about the conditions of the destination country. The rules for documents, vaccination or entry may differ.
Don't touch the dog without consent, don't call him, don't feed him, and don't take him by the harness. His space, rest and needs are decided primarily by his man.
On a longer journey it is convenient to have water, bowl, well-known food and a short stop plan.
Source: Czech Railways