We have a Bichon and needed to fence in a part of the back yard for her to do her business and exercise. I purchase 6 of the 30" high and link them together and connected them to the house to make a 20'by 56'pen relatively cheap. A few wooden stakes every 16' will stabilize it. We can step over it so we don't need a gate and I can take it down in minutes when I get ready to mow the grass.
We travel in a travel trailer 4 or 5 months a year. This fence is great for our 2 mini doxis. it is the first thing we set up and last thing loaded when we move. Suggest taller fences for bigger dogs and grounding them as a fiends larger dog jumped over our short fence and knocked it over.
Midwest Ex-Pens are one of the best. I have both the ones with and without the door. The door comes in handy for smaller dogs, but I prefer to just open the two sides up for larger dogs. They are compact when not in use. They fold up like a pancake and are fairly lightweight depending on the size you buy.