Mr IRONSTONE Dog Playpen with Anti-Rust Coating, 32" Height 16 Panels Portable & Foldable Indoor/Outdoor Pet Fence for Large, Medium, or Small Dogs, Durable Exercise Pen Review
By Dr. Lena Ortiz · Canine wellness writer · Published 2026-06-17 · Updated 2026-06-24
4.6(763)Amazon rating$129.99200+ bought last month
Our verdict
The Mr IRONSTONE 16 panel exercise pen is a sturdy anti-rust metal enclosure standing 32 inches tall, and with 763 ratings averaging 4.6 stars it is one of the more trusted metal playpens for medium and large dogs in this lineup.
Medium, large, and giant breed dogs that need a tall, sturdy metal pen for indoor or outdoor exercise space, and owners who want a hammered-finish look that resists rust.
Skip if
You want a lightweight fabric pop-up pen for travel, or you need something that ships quickly, since this listing shows only 9 left in stock at the time of this review.
Breed size Giant, Large, Medium
Weight 53.8 Pounds
Priced 86% above the category median ($69.99 across 101 tracked models)
Our scorecard
4.6/5overall
Owner rating4.6/5
4.6 average across 763 owner ratings
Popularity3.1/5
763 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog and cat food, health, gear and grooming we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
This Mr IRONSTONE pen is built from 16 metal panels standing 32 inches tall, finished with an anti-rust coating in a silver hammered look that is meant to resist chips and corrosion better than a plain painted finish over time.
At 53.8 pounds, it is a substantial, no-assembly metal enclosure rather than a fold-flat fabric pen, positioning it for medium, large, and giant breed dogs that need a taller, sturdier barrier for indoor or outdoor use.
Priced at $129.99, it costs more than fabric pop-up pens but reflects its all-metal build. With 763 ratings averaging 4.6 stars and about 200 units bought in the past month, it has a strong track record, though the listing shows limited stock available.
Pros
16 metal panels at 32 inches tall for medium, large, and giant breed dogs
Anti-rust coating with a hammered silver finish
No assembly required
53.8 pounds of solid metal construction
4.6 star rating across 763 reviews
Cons
Heavier and bulkier than a fabric pop-up pen, so it is less travel friendly
Higher price point than fabric or mesh playpens
Listing shows only 9 left in stock, so availability can be limited
Specifications
Breed size
Giant, Large, Medium
Weight
53.8 Pounds
Performance notes
The 16 panel metal frame reaches 32 inches tall, which suits medium, large, and giant breed dogs better than a shorter fabric pen, and the anti-rust coating with hammered finish is built to hold up to outdoor exposure over time.
What buyers say
With 763 ratings averaging 4.6 stars and roughly 200 units bought in the past month, this is one of the more heavily reviewed metal exercise pens here, a good sign of consistent satisfaction with the build quality.
No, it is listed as not requiring assembly, though setting up 16 metal panels still takes a few minutes of connecting sections.
How tall is the pen?
It stands 32 inches tall, which is taller than most fabric pop-up pens and better suited to medium, large, and giant breed dogs that could climb or jump over a shorter barrier.
Will the metal rust outdoors?
It has an anti-rust coating with a hammered finish designed to resist corrosion, which makes it a reasonable choice for occasional outdoor use, though no metal coating is fully rust-proof forever.
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