If you are traveling with your pet by train, check the conditions and prices of the company. Always ask for the rates and terms in writing, since the answers might vary depending on the knowledge or interest of the person giving you the infirmation.
Your pet must meet the requirements and you might have to purchase a special ticket. If your pet is accepted on board, remember that you are responsible for any inconvenience or damage he may cause. If for any reason your pet does cause discomfort, you could be asked to change the car or even get off the train and take another one.