Awwww...so cute. He looks so happy and comfy. Actually, I'd probably stay clear of bologna. I don't have the stuff in my house because it's not healthy for anyone. But, I just meant to put a few tiny pieces of something extra good to make him want his food. Really, a part of a scrambled egg or some real chicken from last night's dinner...a little tiny sprinkling of Parmesan cheese...like 1/4 of a tsp or a 1/4 tsp of cottage cheese...something to make it smellier might entice him to eat. I had to do this with my girl Chi when she was younger. She wasn't inclined to eat very well. She'll eat now (she's a hog) without putting stuff on it, but I often do anyhow just to give them a little variety. Just make sure if you give other meat that it wasn't cooked with onion. Onion is toxic to dogs. I think he'll come around, once he's more use to his new place and all the changes.
One thing that can happen when worrying about their eating, might be over feeding and letting them get fat. My dogs have been a little on the chubby side off and on through their lives. Once I notice they're starting to look a bit on the rotund side, I cut them back but it can sneak up on you easily with these tiny dogs. LOL.
Anyhow, I'm so glad you found yourself such a sweet little companion. And I bet he's going to have a really nice life.