These are necessary at the Shelter where I work when we have moms with litters of puppies. The only problem I see with them is that sometimes the pups will get through. I'm worried they will get stuck so I would recommend making sure they are supervised at all times.

Pros: Great for litters

Cons: Some puppies get stuck

It looks really small and the dogs will not get enough excersise.

Pros: it wont rust

Cons: its realy small

This is good if you have a puppy and are going to be out for a bit and need safety for him while he plays. I wouldn't want someone to use it as a permanent pen.

Pros: convenient

Cons: not for permanent fencing for dog

Our local shelter use's these for adoption days. They are great for displaying puppies for show. Easy to clean and doesn't rust.

Pros: quick to assemble, washable

Cons: none

Bebop has a real issue with anxiety and so when we go to work we set this pen up and her and Murphy are able to play (a little) without eliminating on the floor or tearing anything up. Our furniture is safe at last!

Pros: can be transported, stores easy

Cons: can be hard to put together