That is about the standard size expens come in, eight panels. The height is up to you. I have two ex pens and love having them both. I have the pens inside and up against a wall so they have even more space.
You can get add on panels to add on to the pen, not all ex pens have this option so you might want make sure it can have panels added on to it.
Mine got used to it right away, but then again they were never in the pen alone, they always had someone to play with. |