How do your dogs behave with bigger dogs? You don't want to set this pit put to fail because your dogs behave improperly. If this pit bull is already around yorkies than they now how to behave around small dogs. Many times it is the little dog that does something to set the bigger one off.
Make sure pits are allowed in your area and check with your homeowners to make sure they are allowed.
I would also plan to go to training with the pit to build the bond between yourself and it.
I would not leave the yorkies unattended with pitbull but that applies with new dog.
Good luck
