I have 2.5 acres of land and I'm surrounded by hundreds of acres of farm land, but I am looking into building a fenced in area for my pup to play, train, and I might even set up an agility course. I'm not trying to go in the poor house building it, but I want it to be substantial. It would be nice to have an area where she could run all out without being told to come herw because she is getting to far ahead. Any suggestions on dimensions would be great. What size is a normal agility course?