Skaffloc is right, places are not allowed to ask you about your disability or request any certification or paperwork. The animal doesn't have to be vested or badged, either, although it can help to diffuse related tension. Hotels, motels, and inns are bound by the ADA and are also prohibited from charging extra fees or deposits. The ADA actually doesn't even have an official certification that you can show. It specifically prohibits you from being required to use a service vest. There are training certs for highly trained service animals like seeing eye dogs, but all the hotel can ask you is if it's a service animal and what tasks it's been trained to perform, they can't ask about your disability. There's also companies that, with no requirements, will "register" your service animal and provide you with a license and documentation to show for these events. Alas, you should be fine. They may have even noticed and just not said anything because they know they can't really ask you. As long as Euler is kept under control (doesn't even have to be on a leash but maybe don't push your luck?) and is not barking or causing a disturbance with accidents or being aggressive, they cannot ask you to leave. I voted B, but in terms of pro-action I really mean A.