Help: Does Stanley have doggie separation anxiety?

I have a doggie dilemma and in need of advice on how to stop Stanley (my loveable pooch) from barking incessantly when I’m not at home. I believe  it’s probably caused by separation anxiety and I’m at a loss as to how to solve the problem.

At his first modelling assignment as Toto for a friends Wizard of Oz shoot.

It only came to light yesterday afternoon when I returned home from my casual job. My neighbour approached me and said Stanley barks ‘all day long, everyday’, which is incorrect as I’m only gone a few hours, a few days a week . And whilst I agree it  is very frustrating to have a dog bark continuously, to have a neighbour say ‘your dog nearly died the other day, I was ready to do it myself…’ was very upsetting.

So I now need to find a solution, as although he can go to a friends when I’m away, that is not always practical.
Obedience training perhaps? Or has anyone had a similar problem and found a solution?

Feel free to leave your ideas and thoughts as I would appreciate any advice.