If renting, The Shelter is not responsible for Landlord permissions to add a pet to your household.

Your new animal does not know that you are its new home. It only knows is that once again the environment is different. The different smells, different noises, different people who treat it in different way means Your animal needs TIME to do just that, adjust to everything new in its live. 
These new things and your expectations are going to cause your dog some initial stress until it adjusts to its new life. 
Please be patient with your new Animal!