I agree completely with
kclinch. I think it probably stems from leadership issues. Does he feel as if
he is in command and therefore needs to protect you from danger? Work the issue like
kclinch suggested until he is comfortable that you are in control and you will protect him.
Shock collars/prong collars etc. - BAD,BAD,BAD,BAD ( just making sure you do not misunderstand my opinion!

) I say this all too often ..rottweilers are extremely intelligent dogs. TRAINING,TRAINING,TRAINING ..show them what is expected of them and they will go out of their way to PLEASE you ..or you can take the
LAZY way out and condition a response out of fear or punishment.