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  Ditto on the down command.  Great advice.I began training my YT to go outside from the start.  I do not have a fenced in yard, but used a long retractable leash attached to his harness.  Took lots and lots of trips outside in all weather, but it worked for me.  We both have foul weather gear to wear, of course.
 
 Lots of good luck with your new puppy.
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