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If you need an enclosed area for your puppy or small to mid-sized dog to romp, consider getting a portable exercise pen. They come in either metal or plastic in different heights to meet the needs of your dog. Some units are modular, allowing you to expand the size of the pen larger, if necessary. Portable pens are convenient because they are fairly easy to fold up and take with you. Most can be used indoors or outdoors.
An "Xpen" (shortened term used commonly for exercise pens) is a MUST for any dog or puppy, regardless of their age or size. It will contain the dog or puppy in emergency situations, limit the amount of damage they can do to your home in the event of potty training issues or being ill, etc.
If you favor trips to the park, there are portable netted Xpens that fold up similiar to a sling car and will provide safety for your pet and peace of mind for you at the same time!