Holy Cr** I would have TOLD HER OFF - first you don't FLIP a scared dog on his back without talking to him or letting him take a wiff of your scent - She sounds like a TERRIBLE vet and you were way too nice - she scared him period - poor guy - If I were you and she is in a clinic type practice I would for sure make some calls - I wonder if you can report vets like you can attorneys or Doctors ? She sounds awful and my heart was cringing just reading your email -

poor baby - I would def find another vet and I hope you didn't pay - if you did - cancel it !!
I hope SHE has FLEAS !!!