stressed puppy

A little over 2 months ago I rescued a 7 month old lab/husky mix with possibly some Dane in him. He is now 9 months old and I have been training him myself, as well as going to a 6 week training class with him. Back story (the little information I do know) on Steel: he was found as a puppy on...

I just got him last night, hes a purebred Lhasa Apso, 7 weeks old. I got him around 7pm last night and he really is lazy and fat !! But thats not what worries me, i dont know if its just him being exhausted or stressed but he hasnt gone potty since ive had him.. he eats just fine and drinks but...