Welcome to YT
Cant wait to see pics of your new furbaby! Its so exciting when you first get one

He's still a baby, so being left alone is a learning process for him. Try leaving the TV on if your gone, also lots of toys (interactive)...they even have a teddy bear that has a heartbeat, to help out with that. I would definately not be leaving your baby with the bigger dog unsupervised and it'd probably be a long while before I did. I sure hope this helps and Im by far not an expert, but feel free to PM with questions, concerns or just to brag about your furbaby a lil