I have just received a complaint from the council about my dog barking late at night and early in the morning. I am fairly certain it is from someone whose garden backs on to mine and who has recently moved in.
The dog goes out first thing at 6am - I am making tea at that point so although she barks to be let in, it will be less than a minute. I generally go to bed at 10.30/11 midweek and again I am pottering around in the kitchen so the dog will bark a few times and be let back in - very occasionally it will be later or earlier.
I don't consider the level of barking to be unreasonable or the above times to be particularly late or early, but would be interested to know what is considered excessive noise.