That is an urban legend like the Doberman's brain never stops growing and eventually drives them insane.
I used to have a red doberman. Loved him to bits and he was a TOTAL coward unless he smelled fear on you. THEN and only THEN would he "grow a pair." Bo snapped at me just once. When he did that - I opened his moth - stuck in my arm and told him - you wanna bite me - this is your chance. He spat out my arm and never once snapped at me again and I had him for years. I did knock him out once though . . . . YES I decked a dog - but that's another story . . . .
Stand up for what is right, even if you have to stand alone.
He was one of the nitwits who had the sit in for gun control earlier this year. Here's what pisses me off. He straight up calls Trump an illegitimate president but apparently Trump is supposed to sit...