Originally Posted by aerospace
According to celebritys website you are not required to provide documentation that your animal is a service animal but it is suggested. They do have some requirements such as letting them know 30days prior to sailing and have to be supervised 24/7, never allowed in stateroom unattended and on leash in public areas.
I think letting a cruise line know 30 days in advance is a good idea. This way they can set up an area for the dog to do his business. I would also guess they might give you advice on any ports you will be visiting. Remember that just because the ship follows the ADA, foreign countries may have different laws. Just better to be prepared.