Looking for pros and cons on designs for a working pen for starting a young horse. We’re looking to build in the spring and I initially planned for a 60 ft round pen, but then had a mentor mention considering a square pen or hybrid (think D shape) which offers corners to encourage lifting the shoulders. I’ve only ever had round pens, but I like the idea of the square pen. Wondering if anyone has done a square pen instead of round pen and did you like it?
For construction, do you use panels or build a permanent structure? What helped you decide (price, flexibility, etc)? I want to do a permanent structure, but also like the idea of a panel system being modular if I change my mind or we move.
For reference I mainly trail ride now, but may get back into dressage or eventing eventually with a younger horse. TIA.