I was thinking of taking a portable crate and crating him during the appointment, but decided that was too much trouble. Plus the portable crate is really flimsy and I have better control over him when he is not crated. Plus how is he supposed to perform tasks from inside a crate? So I decided against the portable crate.
What I did was pull the chair beside the doctor's desk forward so that Isaac could go behind the chair. I had him between the chair and the wall, with the desk blocking him in on the third side. I put him in a down stay and had him stay there.
She seemed comfortable. She didn't say anything about the dog. Didn't act nervous. Since she didn't bring it up, I didn't either.