So do you recommend not trying with a female??? I want your honest op...I wont get defensive

. Maybe I should start "handeling" with something easier...Agility?
Why is it that Rotties are no longer bred for strength? I thought the opposite; they are bred to work...is this not the same as being bred for strength? Do they not need strength to work?
How do you pick the activity that is right for your dog? (example: herding, agility, sch, rally)