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.
11 cruises in 2012, 90 nights at sea visiting 15 countries
8 cruises in 2013, 56 nights at sea visiting 7 countries
Next cruise: None scheduled
PM me if you need a cruisemate for any Europe, transatlantic, or Panama Canal cruises
Date, ship, cost pp