welcome to BPO! you'll definately get a lot of good ideas here.
can i offer a few? i'm the BPO hard nose rottie owner too!
get her under control at 9 months before she can take you down at 12 first of all. you are the boss...tell her that. if she doesn't listen...get in her face and make her listen.
Grace may be spoiled...but she earned spoiled. she's well behaved and knows i'm the boss. if she forgets i don't have a problem reminding her. she forgets to listen sometimes...so i flip my 104 pound monster over on her back and refresh her memory. i growl and bark at her and i nuzzle her head like her mother would have.
Rotties are stubborn most of the time. not all of them are. they are smart and determined. we're more determined and we have to act the part.
email me if you have any specific questions.
before my divorce, my ex and i had 2 rotts (both under 2) at the same time. if that doesn't make you feel like the boss, nothing will. I walked them together, i played with them together, i raised them together. they turned out better than most little dosil dogs.