I have an Akita/Shiba Inu mix, and he’s the same way.
Dogs are excellent judges of character.
3 posts on character within 2 minutes ... LOL
Our Japanese Akita hasn’t ever bitten, thank God. I know he would come under the dangerous animal rules. He is very self-contained and will grumble at someone if he is cranky or block them if they don’t have the permission he thinks they need to go further. He weighs 110 and is the ultimate unmovable object. Usually, he loves attention and gives hugs while standing for pets. He knows what Pretty Boy means!
However, once, a woman he knew visited with her husband, whom he did not know and who is also an SOB. Our boy took one look at the husband and promptly raised his leg and peed right next to him, on the trash can. He has never done that before or since. I am sure he was marking his territory and wanted the guy gone.
He pegged the guy perfectly.