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Location: Surrey
Joined: Jun 2010
Posts: 4,420
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I'm no expert but the very fact that a loose GSD on his own land only gave the other dog a nick, rather than a very serious injury, suggests to me that perhaps your dog is actually suffering from fear aggression, rather than having a true aggressive nature towards other dogs. He was attacked by another dog, and has now learnt that making himself big and scary towards other dogs prevents them from approaching him, or makes you remove him from what is, to him, a scary situation, so he's found a method that works for him. Lots of GSDs tend to be fear aggressive or dog reactive (the latter tend to give it the big scary look on lead but actually mingle fine in other situations) because they're quite a sensitive breed.
I would recommend finding a good behaviourist, who uses positive reinforcement - as you've found out, negative methods like bark collars, etc. do not work, or in the case of the water, they have short impact until the dog figures them out. You seem to have two issues to work on here, the dog aggression (whatever the cause may be) and it sounds like a case of seperation anxiety may be coming in to play with the barking all day too. Again, another problem GSDs are prone to, given their loyal nature. Barking at passers by may be something you can deal with yourself, with some friends/family to act as stooge people passing, and something like clicker training to teach your dog to both bark and be quiet on command - you should build this up from a situation where there's no distraction or stimulation and make sure he's doing it 100% then before you try to train him to go quiet from something setting him off. Or another method is for him to associate people passing by as a positive thing - again, with a stooge to keep walking past, but before he gets a chance to bark, throw down lots of treats/feed him treat after treat. After a few goes of that he'll soon realise passerby = treats and his behaviour should change from defensive barking, to waiting for his treats. Perhaps it may be worth starting a thread for this issue seperately, I haven't actually put it into practise, just read the above methods, so someone with more experience may be able to explain better.
To find a behaviourist, I'd check out this website of APBC registered behaviourists -
http://www.apbc.org.uk/. Is your boy insured? Some policies will cover behaviourist treatment, if money is an issue - or as suggested above, perhaps scrimp enough money to pay for one session, probably with someone who's had several good recommendations so you're not risking wasting your money, and see what advice they can give you in the immediate future until you can afford further sessions.
If you do want to socialise him at a safe level, there is are a couple of GSD forums that arrange socialisation walks all over the UK. They certainly welcome 'problem' dogs - obviously insisting that your dog is muzzled & on-lead if required, and that you have a minimum of third party insurance just incase, but they have certainly had some pretty scared/troubled dogs on the walks I've been on and the members of the walk do accomodate the dogs and the owners - whether that's a couple of them hanging back from the main group so that your dog is only initially dealing with one or two other dogs, to giving advice from their years of GSD experience. I can PM you the forum link that I attend walks with if you think it may help.
If you really are struggling, mentally, physically or financially, do not write your boy off as un-rehomable, I have seen far worse behaved dogs go into rescue and end up in homes with people who have plenty of experience and are able to turn the dog around. These traits seem very typical of the GSD breed so in a worst case scenario please do contact your local GSD rescues, as a breed specific rescue may be able to help more than your generic rescue like Dogs Trust etc. Where are you located roughly? I may be able to recommend a local rescue who may be able to help, even if it's not to rehome your boy but to recommend a local behaviourist or even offer help themselves - my local rescue were fab when I was having some problems with my previous GSD and didn't have forums like this to ask advice on.