Hi there, I do find it hard to be cross at those little faces. Being firm is important tho. There's nothing worse than a badly behaved dog - no matter what the size!
Hugging them when they do the right thing
is the right thing to do! If your dog stops the bad behaviour and comes and sits when you tell them to PRAISE PRAISE PRAISE.
It's sometimes easy to forget to praise the good behaviour cos we don't notice it as much as the bad behaviour.