Square 4-panel exercise pen builds a 36 by 36 in zone that gives puppies and small pets a defined play area without taking over a room. Carbon steel panels each measure 24 in tall by 36 in wide and lock together with two quick-release latches. A 600D Oxford bottom mat protects floors while a matching mesh top cover keeps pets contained and shields against debris. Four ground stakes and 16 tension straps anchor the pen outdoors and the lightweight frame folds flat for storage between uses.