Jim,
I've been shooting dogs since 2000 -- including 7 Rottie Nationals and 1 Doberman National -- and the only dog that has ever actually bitten me was a Parson Russell Terrier 5 seconds after he gave me kisses. Looked me straight in the eye and nipped my cheek. Wasn't mad at me or being vicious; it was just his "unique" way of expressing his affection for me . These are tough little guys who were bred to hunt red fox. They are totally fearless with incredible drive.

Jim