No breed specific fear here. Agree with most that it's a case by case basis
I know when I pass a few of the dogs in my local area that I know are pests (a big black lab? and a big nuggetty Jack russell) Scottie goes into defines mode - he tried to go the JRT the other night. Yet he can walk loose lead past a happy dog who barks at us without fail every day (we can't avoid it - it lives at the bottom of our drive). So I get what you're saying when you say Nero looks to you for reassurance.