I disagree with the two posters above.
IMO, the Iris is a horribly designed pen, that is made for even a moderate climber to escape. The horizontal bars make it like a ladder, so an active pup can easily scramble up it. The velcro mesh cover is worthless, and does nothing to hamper an escape artist.
A tall pen with vertical bars is the only thing to thwart a climber.
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