There are two fenced in areas and one is smaller yes. But they don't specifically delineate for big or small dogs. The smaller fenced in area has agility course for dogs and I have seen people bring both big and small dogs into that area to use it.
The small area is usually used for shy dogs, but there is a course in the small one that I have seen people use.
I agree with Hanton. Both areas are for all sized dogs.
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