
I'm sure you've heard my story before as I have told it many a time. The ugliest word I know in the English language is "neighbour" and I will never ever again live near other people because of what we went through.
Your neighbour needs to make an official complaint to the council. If he doesn't, and you have done all you can to prevent barking, then he doesn't have a leg to stand on. I'd try recording the dogs -there was a thread not long ago about people testing it out.
When the council receives a noise complaint they have to send you a letter, and the person who has made the complaint is sent a diary to fill in over 14 days, detailing what times he hears barking, and for how long. This was the first thing that happened to us. Our neighbours blatantly lied and said the dogs barked non stop every day between 7 pm and 10 pm. They must have noticed we went to dog training during those times, but only ONCE a week. The rest of the time I was at home, so knew full well there was no excessive barking.
A lot of people don't bother to return the diary and then there's nothing else the council can do. Our neighbours did, and according to the diary there clearly was too much barking (as they had lied) so the council asked the neighbours if they wanted listening equipment installed, to record how much is heard in their property and for how long. The neighbours refused. After 3 turns of this, the council told the neighbours if they refused the listening equipment again, they would not accept more complaints. So they agreed. The dog owner will NOT be told when listening is going on, and also will not be told of the outcome unless there is decided to be a problem in which case action will be taken. We didn't leave things alone but kept calling the council ourselves. Thus we found out that the first time listening equipment was installed (which can pinpoint WHERE the barking originates, and the recordings of which will be listened to by a group of people) -it was proved our dogs did NOT bark too much. So the neighbours left it a bit longer, then made another complaint, lied in the diary, had listening equipment installed again, and once again it was determined our dogs did not bark too much.
By this time, needless to say, we were walking on eggshells, terrified of the slightest noise, and did not dare to EVER leave the dogs alone. For 2 years we didn't leave them alone for even 5 minutes unless there was a real emergency and we had no choice. We put the house on the market as we realised the neighbours disliked us and wanted us gone, and who wants to stay then? The complaining neighbours then involved the neighbours on the other side as well.
Took years to sell the house and move away, and those were terrible years. We had a total of 8 official complaints plus some straight from the neighbours. The last time they tried to complain about dog poo in the garden, but that was also proved to not be excessive as it was picked up every day. The neighbours then decided that if our dogs did not officially bark too much, they'd ensure they did. This I found out when I was at home one evening, alone, and the neighbours clearly thought I was not home. Suddenly I heard people banging on the windows and kicking at the front door. Needless to say the dogs barked! The same happened at 2 am once when my husband worked nights. They seemed to think that if there was no car in the drive, then nobody could be at home.
We took legal advice, we tried counter complaints (both neighbours had dogs as well, that did bark) but it was pointless. Even Trevor Cooper the dog law solicitor said that even though we were in the right, the only thing we could do to avoid all of this was to move away. He said the same at his seminar last year. If you can move, DO IT. We now live in the countryside, only one neighbour that isn't very close. And the dogs bark a LOT more as it is so quiet here that anything happening is unusual, such as a car going past.
Legally, there are no set rules, but you can't have dogs barking at anti social hours which is before 7 am and after 11 pm. Excessive barking is not a bit of woofing now and then, it is constant non stop barking for 15-20 minutes or so.
It's also interesting how people perceive barking. We now have my elderly disabled mother in law living with us. Every time we have to go out and leave her (never for more than an hour, as she cannot cope on her own) when we come back she says "the dogs never stopped barking ALL the time you were gone!" And I believed her. She loves dogs, she doesn't say it to be nasty. Then a few weeks ago I had bad toothache and was in bed. My husband went out to do some shopping and MIL thought she was alone. When hubby came home she told him the usual -the dogs barked ALL the time he was gone, non stop. Except they DIDN'T, which I knew as I had been in bed all the time, reading, and knew that they had barked a couple of times but not at all constantly!