I came across this product, Cool Runner Pro Series Aluminum Dog Pen and thought I had found the dog pen of my dreams!
Vertical only Bars!

Thinking that this enclosure would be my savior I put the hefty price tag aside
For my purposes I ordered the 36 inch high by 30 inch long (8 section) to the tune of $400+.

I was so excited to get this pen and put it into action because I use portable dog pens regularly for adoption events, containing puppy litters, closing off an area to dogs and much, much more!

Test #1 of this dog pen was done with a 4-month-old Pup.

He was a larger puppy than I would usually contain but needed to contain him for specific reasons.


Lightweight, Easily Carried, Setup is relatively easy, Vertical bars prevent climbing out of the pen.


The dog(s) can push this pen around with ease; scratches the floor (wood or slate), No tools to help weigh it down or attach to prevent movement, the “unit” is hard to carry as the panels, even with the velcro attached as shown, separate and drag.


The picture below shows the unit collapsed with the velcro bands fastened around and the handles. Looks good, right?

Well, when you actually carry it the middle sections sink a bit and can drag on the floor. This didn’t work for me.

Collapsible Dog Pen

Photo Credit: Amazon

Now, we’ll move onto the other experience with the pen.

Obviously this dog pen won’t work with larger puppies but I decided to try it one more time.

Test #2 of this collapsible dog pen

Two new fosters had arrived – 8 wks old Greyhound puppies and I thought I’d give it another test with different sized puppies. I set the dog pen up in a room to prevent it from being pushed around.
I set it up and put the pups in it!


I left the room for a minute and came back to find one of the 4 puppies OUT OF THE PEN!!

Oh darn!
It can’t even contain these smaller pups?

I had to find out how this little girl was getting out so quickly! Before I knew it she was back IN the pen!
Oh Good Grief!

I sat and watched her a bit and discovered she could sneak her way through the larger openings between the panels.

Dog Pen

Photo credit: Amazon

I saw her wiggle through the front openings of the pen. (Red Arrows point to the areas where it is possible for a puppy to get through. She simply went back and forth at her leisure!

OK, so maybe she was a smaller female and actually not indicative of puppies in general, after all greyhounds are very slim! It was then that I saw the larger male do the exact same thing…a little harder to sneak out no question about it, but he did it over and over again.

So my opinion of this pen (and I have used several pens in comparison) is that it is NOT worth $400+. The vertical bars aren’t a benefit if the puppy can squeeze through 8 openings on the expanded pen.

The Cool Runner collapsible dog pen wasn’t worth the extra cost. I use (and will continue to use) is the Courtyard Kennel, a modular pen that is very flexible and adopts to a lot of places and uses. It’s sturdy and the only real downfall is that puppies can climb the panels. So until someone else addresses the weaknesses of existing expandable pens on the market I will continue to use the Courtyard Kennel!

Recommended Modular Dog Pen

Photo Credit: Hayneedle.com