Following on a bit from the dominant dog thread I wonder if anyone has any advice please :)
GingerDog is a 5 yr old entire working cocker. DH We got him at 16 weeks from a most unpleasant man who I strongly suspect would have shot him otherwise as he was due to go on holiday 
GingerDog has always been "weird", behaviour I now suspect stems from his early life. I have always described him as sly, a term I'm not sure whether is acceptable in dog circles, it's just how he is.
He will work and is a biddable beating companion. He is well trained but on many occasions will simply choose not to do as asked. A raised voice, manoeuvring to the correct position or any sign of displeasure causes him to hit the floor in a submissive way, swiftly replaced by gleeful running about, tail wagging etc. not really the behaviour of a dog who believed 10 seconds ago he was about to be beaten? (FWIW I am quite convinced he has been beaten/ kicked before we got him) He knows what to do, he just chooses not to do it (simple things like sitting at the kerb, not pushing through the door, dropping to a whistle) He is also "dominant" with other dogs as described in the other thread. He has been nipped at on so many occasions it must be down to him and the way he handles himself around other dogs, though he himself is non-aggressive. Mostly he completely ignores other dogs now, even the puppy.
Aside from that (and the thing that makes me saddest) is that he seems to have no joy in him. He is very jealous and will lay claim to DH or go to his crate. The outside world is viewed with baleful eyes and he never seems particularly happy unless out walking or when we arrive home (thrilled to see us then, just pissed off with us the rest of the time)
The strange thing is he really is a perfect pet, clean, quiet, can be taken anywhere, happy to be left alone- many people would kill for a dog like him. He just seems so disengaged with us I feel sorry for him. Any simple tips we could make a start on to try and make his life a bit happier would be great.
PS- sorry, that turned out to be a post of epic proportions :)