Well congrats! Pretty much you have to let nature take its course.... But I have found sit in the middle of the couch so there is room on both sides of you and no territory issues. Take both everywhere with you, even the vets. Play with both at the same time, even if you have to multitask and play two different games at once. More than likely they will bond rather quickly. Be sure the Yorkiepoo never gets left out. It was his home first. Best of luck and congrats!