I have this one and love it!
Convertible Pet Yard - Crates & Kennels - Dog - PetSmart
You can use a few or all of the panels and make it many sizes. You can use it as a pen, or as a gate. I use it as a gate for a large irregular opening between the kitchen/dining and the living room. It's 28" high so it's tall than most. And, what I really like is it has vertical bars so they can't use their feet to climb or jump over and out. It's metal & not breakable plastic, but also light enough that I can move it easily to clean, reshape, etc. It's been worth every penny.
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He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown