You may/may not have any problems w/ Jack (cute name by the way) getting along w/ another Yorkie. You'll have to simply try it out and make it work and there are plenty of ways to do this! My guess is that Jack would be just fine, I'm anticipating that these poor pups from that seizure aren't exactly going to be happy/rambunctious kids! So you may get lucky and can use that to your advantage and who knows, Jack may bring them out of their shell! If you do manage to rescue one, please fill us in! There are many people here that wish we could be one of their new homes!