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  In the house, my pup will run with something in his mouth that he wants to keep.....but, I can catch him.  He knows what "stay" means and though he doesn't really come to a dead stop, when I start saying "stay" -- it really slows him down. 
 My pup doesn't pick up much outside - there isn't much around that he can pick up.  So, I don't have much of a problem outside.
 
 You need to really go around your yard - and get it "fixed" so that your Yorkie can't get out.  That would solve that problem!
 
 Good luck -  Carol Jean
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