|   barking 
  Duffy used to bark and whimper (whine) if I left him in his pen.  I got an empty water bottle and put some marbles in it.  When he started the crying /barking routine I went back in and shook the bottle really hard about a foot from his face and said NO.  I only had to do this 2 times.  He is a quiet boy now!  Good luck!  |