Kongs and Bully sticks!!
Bree use to do the same thing in her play pen. I got her to keep herself "busy" with a knog with Pumpkin or a bully stick. The trick is when he barks for you don't go back in to the room until he is quite. b/c he will learn that everytime he "yaps" you will come a running. Than you will be trainned and not him...
