A 43-yr old guy who has never married has got to have issues--but obviously you knew that! I guess the "good" part is that the late 30's/early 40's is when those who've never really dealt with childhood abuse are forced by their depression to finally confront it. Suppression cannot succeed as a long-term tactic. The bad part is, it's hard for them to do it in a R, and there's no knowing how long the process will take.
That said, my H's C tried EMDR as part of his therapy for MLC. My H insisted it didn't work--and yet a few weeks after trying a few sessions, he was coming out of his depression and ready to commit to our M again, so I was left assuming that it had influenced his thinking without his being conscious of it.
I hope your dog gets over the separation anxiety soon!