Long story short my dog was in the gated/fenced front yard with me while my daughter was dropped off by her dad
Neighbor from down the road walked past with their small dog who started barking (snout through my gate) at my dog
I have a German Shepherd and it barked back... I think it perceived the other dog to be a threat to my child so retaliated. All bark no bite mind as many GS owners will know 
My neighbor snapped, told me “get hold of that effin dog” and then said “I don’t like those, they’re vicious” and was raging at me
AIBU to say when I next see them if you don’t want to deal with it, walk on the other side of the road
(To be honest 90% of the time we’re never in the front yard anyway)
Also my dog wouldn’t have batted an eyelid if their’s hadn’t done anything, apparently because mines louder and “looks” scary we’re a danger 