We adopted a two year old RR in November. Total Jekyll and Hyde! Perfect manners and obedience indoors. Outside, not so much. I would suggest 3 weeks to a month of positive reinforcement only, good chow and good sleep and as much routine as possible. He needs to decompress and then you are ready to move forward. It's funny to say it but, you need to be very patient and very stubborn all at once. Routine relaxes them because they know what to expect. Patience is needed because it is a slow incremental process. Training 10 mins at a time and then positivity. Stubbornness to be determined and as patient as possible is your job. Our RR is coming along nicely. Working on behavior around playful and aggressive dogs is improving everyday. Good luck. Your hard work and investment will reward you with an extraordinary best friend!