Hiya Max and CJ and to your mum

. Max you have a good task over CJ on building his confidence, you can be a role model for him when you go to the park, ask mom on giving treats to CJ and also petting him, tell CJ soon he will more socialized and will become so friendly as yours. You should convince mom too to enroll both of you to any obedience or agility training school, that will boosts your confidence and obedience too, as well as everything there was so much fun.