I would have been scared to death!! Thnk goodness you and your dog weren't hurt.
I like to walk my dogs but I don't go to the gated ones. We do have a couple really nice ones here that both have small and large dog areas. I have a couple times let them in but there haven't been any other dogs around.
Personally, I just don't like the fact that all people don't clean up after their dogs and who knows what the other dogs are carrying. Seems when they are set loose in there they go straight to check out the other dogs poop.
It is a lot easier if you're on a leash walking to keep them away from other droppings.