This brings to mind that when children are playing in the playground, which is right behind our small backyard, he'd bark and want to protect 'his' space and 'his' people. He couldn't see them because of our fence, so I'd pick him up to show him the children, saying 'it's just the children playing'. Now he's good with that when I tell him, and no need to show him anymore. Having said that, I do from time to time to reiterate 'the children playing', as he loves people and children in particular. I also did this when we got our roof done, as well as the gardeners. I'd take him o/s to show him and tell him 'the men working'. This works well with other people working o/s as well. Mum's the word
Sometimes I think he barks at the unknown, so showing him takes the guessing out. At least that's from a 'person's' point of view. In his own mind he may just be laughing at me and thinking I'm crazy
