I haven't heard this mentioned. I have owned Rottweilers. Well,
trained, in my opinion, nothing better. When living in MT, our first
Rott, Loki, was an outside dog. We lived on a reservation
(blackfoot), on the outskirts of town, and had a problem with small
items, kids toys, trikes, etc, disappearing. That ended with Loki.
She would only bark a couple times if people were on foot near our
yard. If they left the area, that was all, but she would watch them
until out of sight. Her house was around the back. If a car pulled
up, she would get up out of her house, and walk around the corner of
the house, and sit, watching. If someone got out, she would bark
twice, to let us know. Usually, unless the party knew her, they got
back in their car, and honked. If they came to the door, she would
stand, and watch them, until we said it was Ok. Then she would sit
again, but still watch.
She loved to play with little kids. My wife did Day-care, and the
little kids would ride her, wrestle with her, and she would drag them
all over the yard, if they wanted. She owned them all. and took care
of them all.
I might add, by 14 months old, she weighed over 150 lbs. Big Dog.