Puppy becomes "crazy" against my GF when I get home.
So apperently.. our puppy is calm and behaves towards my girldfriend when they are alone.
But as soon as I get home, she becomes very very crazy, biting, challanging her and so on.
She does not do anything like this towards me. It's enough that I raise my voice for her to obey me.
So is this normal or why is she doing this=