Simon...no you dont...but your followers DO.
Popeye............properly bred using compatable breed lines.Rottweilers can be VERY dangerous or very soft animals if bred wrong....i see so many timid ones its scary.
The definition of a Rottweiler should be powerful,big head short muzzle,confident, correct markings being black shortish hair with a dark brown tan....no grey undercoat showing....i could go on for days.......more importantly BOTH parents should be hip scored with a combined hip of each parent no more than 15 points,they must be also tollerant of children as they do tend to get freaked out at anything eye level to them

...Always see both parents and check if they are good natured dogs........When we walk our dogs and i talk to anyone they sit and watch,will tollerate a stroke....but act dodgy then its curtains for you

PROPER dogs PROPER gardians...but if you are weak and its a proper Rottie they WILL control you/bite you and RUIN your life.