I have 3 dogs of varying mixes weighing from 40-70lbs. We run into limitations a lot, but always manage to find a spot. Most of the time my issue is a 2 dog limit, but I call and ask and they usually say it's not a problem. They just want to discourage the majority from having a ton of dogs.
As for breed restrictions, I'm not positive on the actual mixes of my dogs, but all seem to have some lab in them. When someone asks the breed, I just say they're all lab mixes. In the end, if anything were to happen it's my responsibility no matter what the breed.