Because of the stress that is involved for the humans in relocating, the pug has absorbed all the energies and taken to herself. I would suggest the following:
1. Organize upbeat and happy go lucky events with kids in the house (if he likes kids) and display happiness and high-energy in front of him.
2. Offer her food in areas that he is skeptical of.
3. Please get her checked by vet for stomach problems. Denial in excretion is also a sign of fear-shutdown.
4. Do not give her attention when isolating herself, instead praise like hell when she seems excitable etc.
Good luck! :)