Bigger dogs that climb or jump need taller walls and this 30 in tall exercise pen brings 8 carbon steel panels into a 63 in octagon. Each 30 by 24 in panel locks together with 16 plus 2 tension straps and two slide bolt latches form a swing door for fast entry. Eight ground stakes anchor the pen on grass while a 600D Oxford bottom pad keeps paws off cold concrete or muddy yards.