My father is celiac and I remember specifically in Germany the Brats are pure meat with no filler, the head Chef came out and verified this. Beacause he was getting his without bread they gave him 2 brats.
He still couldn't Drink the Beer Though, so I had an extra one for him.
Everywhere we went they have options. I also remeber at Pizzafari I saw a Button on the cash register for Gluten free pizza, wish I had inquired about it but I did not.
Every restaurant has these rice based Gluten free rolls as well.
they are very accomidating everywhere