Join Date: Apr 2008
Location: Orange County, NC
We don't have a dry lot, but we have kept four mares in our riding ring for days. It's 100x200 (20,000 sq ft), so 500 sq ft/horse, and that's more than enough room without them being crowded for a corral/pen.
For fencing, I prefer corral panels. Quick, easy, and you can always move/rearrange them. They're not cheap, but sometimes you can find used ones that are still in good condition. Otherwise, I would use good, no climb wire horse fencing with a strand of electric at the top.
On the sixth day, God created the Quarter Horse.
On the seventh day, he Painted the good ones.