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  I'm sure someone will post a pic of an x-pen.  If not, look above on the dark blue bar that says "User CP".   Keep going across till you see "search".  Use the search engine.  
 Its a pen you use to keep smaller dogs in thats wonderful to potty train.   Usually they are big enough to put the crate and toys in one end and pee pads at the other end.  Thats where they learn to pee and poop on the pads.  I'd suggest a tall one, cause lots of yorkies will learn to climb out.  I know mine did!
 
 You give them too much free space to roam  around your house, they will pee and poop everywhere.  The x-pen keeps them confined to one smaller area.
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