i have a 4 mos. old boxer named boozer. he's so adorable and he really has LOTS of energy to burn. i have been potty training him and i must say, it is going well though there would still be accidents. because of his somewhat 'success' in potty training, he gets more 'free time' here inside the house, with supervision of course. problem is, he still destroys some of our things. i already taught him the 'leave it' command...sometimes it works but sometimes it doesnt. she ate brown envelopes and papers earlier so i had to crate him. he even broke one of our lamp shades because of his curiosity. he always nibbles on our curtains. im not blaming him but i really want him to behave well. i know he's still young and that he is always curious... but what training should i do in order for him to develop into a not so destructive dog? 