Two questions came up on the same day, and they turn out to be the same question: how do you get in and out? and what keeps them from crawling under that? Both are really asking where this fence opens.
The short answer: there is no swing gate. You unzip a seam between panels, step through, and zip it behind you. And the bottom is open ground, held down by stakes rather than by a floor.
The zipper is the door
Panels connect to each other with zippers, which is also how the pen changes shape and how you add sets to make it bigger. To get in, you open one of those seams. There is no separate hinged door to line up, and nothing extra to buy.
The reason that matters for a dog owner is the second half: the zippers are self-locking YKK, with a hook-and-loop flap over the top of the seam. A plain zipper slider can walk down under pressure when a dog leans on the wall. A self-locking one holds where you left it, and the flap covers the pull so it is not sitting at nose height waiting to be nudged.
Practical notes from the way it is built. Open the seam nearest you rather than the one nearest the dog. Zip fully to the top rather than most of the way, because the last few inches are what the flap closes over. And if you are adding or removing sets, that is the same seam operation, so the pen does not have to come apart to change size.
The bottom is open, and stakes are what hold it
There is no floor panel. This is a ground pen, and we say so on the product page because it changes what the fence can and cannot do.
What holds the base down is 18 hexagonal alloy ground stakes per set, driven in to a printed guide line, plus guy lines running off the top. That is what stops the wall from lifting in wind or being pushed outward when a dog leans into it, and for most dogs it is enough. The panels stand about 30 in (76 cm), on 900 mm poles.
What it will not do is stop a dog who digs. If your dog treats soft ground as a project, an open-bottom pen is the wrong tool and no amount of staking changes that. We would rather say so now than have you find out at a campsite. The same goes for jumping: strong jumpers can clear 30 in, so this is an aid, not a guarantee.
One more case worth naming. On a deck or patio, stakes have nowhere to go. That is the whole reason the All-in-One 2-in-1 exists: it ships with deck clamps that grip the boards as well as forged stakes for when you move it onto grass, so one fence covers both surfaces.
Which one to look at
HOUT Pet Fence Basic Ver 2. Coated polyester on an aluminium-alloy frame, about 30 in (76 cm) tall, hexagonal alloy stakes and guy lines included. One set is 6 panels, roughly 29 linear ft; sets zip together to grow. From $116.99.
HOUT All-in-One 2-in-1 Pet Fence. The same fence with deck clamps included alongside the forged stakes, for decking, patios and open ground. From $127.45.
Questions we get
Can my dog open the zipper? The sliders are self-locking and sit under a hook-and-loop flap, which is there to keep the seam from being worked open. A determined dog with time alone is a different situation, and we would not tell you the pen is dog-proof.
Do I have to stake it every time? On soil, yes. Without stakes it is a fabric wall rather than a pen, and it will move. On decking, use the clamps on the All-in-One instead.
Does the pen have to come apart to make it bigger? No. Panels join at the zippers, so adding a set is the same operation as opening a door.