Hot Rod never used to be until my neighbor got her yorkie(s) and the neighbor on the other side got hers. Now he will bark at people walking across the front of the house and he will bark at the birds flying in the yard. lol
It's kinda funny cause we have barking sessions throughout the day where I will join them.

Strange I know, lol, Hot Rod will bark and Maggie May will wake up barking, it's so hysterical. She has noooo clue what she's barking at. I chime in and we all just sound so ferocious.