I am curious what it is about working in the open workspace that is difficult. I ask because I work in an open concept office (very small just three of us) and I find it nearly unbearable. But I wonder... is that just me or is it because of my bipolar/ anxiety. I used to be able to work from home and now my boss has been making me come in which has caused a downward spiral for me.

I think in terms of explaining the dog you could prepare an answer (whatever you are comfortable with). A brief statement with as little or as much info as you want. Could be "He/she is a working dog"... then turn away from the person so they are clear that is what you are comfortable sharing. Or "My dog helps me with XYZ".

Please keep us posted! I hope it all goes well!!