I believe so I had an amazing experience when I went

No

They don't.

When I visited at the end of December, there was a sign on the door stating they closed early on the 23rd of December and did not re-open until the 26th. They were also closed on New Year's Day.

I eat dinner here every night when we visit Biloxi. If it's a weekend or for the week. Wouldn't eat supper anywhere else. They also serve an amazing breakfast. With all the shrimp boats sitting around, I'd find it hard to believe that food comes outta of a box. Great atmosphere!!

I don't know for sure but unless it is an ADA trained service animal, probably not.

Outside dinning area is approximately 20ft above water level. Gives you great views of Marina, Deer Island and Gulf beyond.

There is a dock behind McElroy that you can tie off to but I am not sure if it requires a boat slip. I would call them and ask

Pretty sure you can in Biloxi bot not in ocean springs

Pretty complete menu