My only advice, Gemp, is to go and scout out the place. If there is a small dog section, use it if you don't feel comfortable with the boys in the big area with other dogs. Sizzle, Hillside and I will use the little dog area with Ronin, Ilsa and Saga to let them get their zoomies out without worrying about what dog is coming around the corner. We always ask people that are coming in if they want to use the little dog area, and if they do, we take the dogs out, wait for them to be done or go home and come back another day.
There are dumb people everywhere, along with their rude dogs. You know your boys well, and if you have any doubts, then don't use it. It's very handy, but if you go and you worry the whole time, they'll wonder what's up.