In most cases, dogs are not allowed on a cruise. You are permitted to take service animals, but pets are not allowed. Some specific cruises may allow dogs such as the Cunard’s Queen Mary 2 cruise, as it has its own kennels and boarding spaces for dogs, but most will not. Guide dogs, hearing dogs, seizure alert dogs and medical alert dogs are allowed on most cruise ships as they are essential for the wellbeing of the passenger. However, these dogs will need to be officially registered, and you will need to run it by the cruise line first before booking. As some passengers claim that their dogs are service dogs to get around this rule, you will have to provide the proper documentation for your service dog in order to board with them.