M.L.
Well, ours is new. Sort of. We raise pups for Canine Companions for Independence, and offered to take an older puppy who needed re-homing, instead of an eight-week-old baby. We've done this before, and it's always interesting.
So Yan (a Lab/Golden cross) arrived last Saturday. Yan. Not Yam. Not Juan. Not what you do when you're sleepy. It's as if he were a German dog named John. Yahn. I don't know who picked out the name.
So now he has to find out that these strangers are the boss of him now. I think he's surprised to find out there are still the same rules! When I put his cape and his Gentle Leader on him, he looked amazed (to use your word). In the last week he has tried all the naughty stuff he can come up with to see what he can get away with. Open a closet door for five seconds to hang something up, and he can grab a shoe and be off with it! Fastest mouth in the west.
But he's a kid (eight months old), and that's what kids do. He's settling down, bit by bit. He's had good teaching before, and I think he'll turn out all right.
I hope your dog is feeling happier now. Dogs know when they've done something they shouldn't, even if no one says anything. We've had pups get hold of things they shouldn't and, instead of sneaking away, they'll come show me what they have in their mouths.