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  In my opinion he is too young to be out when you are not home.  I think it is fine that he can wander about when you are there but it worries me for a full day.. he is still a puppy.  I kept a play pen for almost a year with my guys.  
 Also, if he is used to sleeping in the play pen at night he may become confused and then he will whine.  He needs a "place".. like kristen said a safe place.
 
 Good luck and keep us posted
 
				__________________ Shinja  mom to  Remy   lil Sis to     Bailey and Sammy  |