I would be asking some questions. Why would your dog be where they are grooming?
Not sure how the office is set up. But the kennel and grooming areas are normally not together. At least that is my experince where ever we have lived with all the vet's we have used.
I would most definitly get to the bottom of what happen, and would change vets, as your furbaby is not going to want to go back, and will remember what happened.