Hi! Just wondering. How old is Angus? Has be always lived with you? Did he have a "close" relationship with his grandparents before you moved in? How long were you there? Did your parents dog sit him during the day when you were at work? I'm not too familiar with terriers and "typical" behavior, if there is such a thing! Maybe he just became quite attached to them and their home during that period of time and needs a long, patient period of adjustment in his new digs. Maybe you should not let the grandparents see him for a while, till he becomes accustomed to his new house? Spend lots of time with him, one on one. Make the new home "his" special place. A place where he gets lots of attention, praise and positive associations. I'm sure you've already set up his bed, his special place etc. Maybe he doesn't like all the "new" smells associated with building? Please let us know if you've had any success. Sorry I couldn't be of more help!