No, I'm not the neighbour in question – I'm the owner of the dog! We live in a detached house on a compact estate (i.e. most houses have shared driveways) with only a few meters between houses. We have a 1-year-old young adolescent collie who barks at certain noises coming from outside. We're working on it using counter conditioning and other methods with the help of a trainer, but it's a very very slow progress due to his anxiety and age.
I have no idea if neighbours can hear our dog barking when they are inside their houses (with our windows closed) – these are 8-year-old redrow homes so I guess the sound isolation is "okay".
Anyway, let's say they CAN hear our dog bark (it's a loud bark, though low-pitch) and I'm wondering whether you personally would consider it a 'noise nuisance'? He doesn't bark for long; it's 1 to 15 barks lasting 1-20 seconds. But on "bad" days when there's a lot of triggers, which happens roughly 3-4 days a week, these bark bursts can happen once in 1-2 hours on average. Would you consider that too frequent? Some days are good and he might only utter a single bark all day, and on very good days he doesn't bark at all.
I'm just working hard on trying to get him less afraid of the noises, but the fact I'm also worrying about what our neighbours might think isn't helping me, and when he barks that's sometimes the first thing I think about, and perhaps he senses my tension which certainly doesn't help.
Nobody's complained yet, and unfortunately I'm too shy and generally introverted to knock on their door and ask. Perhaps I will one day if I pass them on the street, but we hardly ever see any of them / everyone keeps to themselves.