Service dogs travelling with disabled passengers, in accordance with specific regulations, are permitted access to all the rooms on the vessel. Service dogs board for free, although you need to indicate you will be travelling with one when booking your reservation.
Emotional support animals are included in this category, as long as the passenger has a certificate from the doctor, psychologist or psychiatrist accrediting it.
According the European Directive for animal ro-ro passenger ferries, you can consult EC Council Rule No. 1/2005, 22 de 2004.