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While most puppies will need to have a fenced off area, Chihuahuas can get by in a space the size of – or in an actual – playpen. As Jeanne Eubanks of Uey’s Chihuahuas puts it, “A fenced in playpen with everything they need in the playpen is perfect.
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David Anderson (The Complete Guide to Chihuahuas: Finding, Raising, Training, Protecting, and Loving your new Chihuahua Puppy)