My cats have their teeth cleaned regularly and there has never been a problem with the anesthesia. My youngest Lab, Sam, had eye surgery last fall and he was just pitiful when I got him home. We had to fashion a bucket to put over his head to protect the eyes and he sat out on the carport weaving back and forth for several hours. I just sat down and cried because he was so pitiful. He was back to normal the next day and has done great ever since. I wish now I had left him overnight rather than see him like that. The vet did what he had to do and the surgery was very delicate and he had to be totally knocked out. When we took him back to get his stitches out they had to sedate him and I had to leave while they did it because I got so upset. I can't stand the thoughts of any of my fur children suffering!!
Back to your problem. The vet needs to be made aware of your feelings and that you will not tolerate your pet being mistreated. I'd write a letter and send a copy to BBB and find another vet based upon recommendations from pet owners. The vet I go to is more expensive than the others in the area but they are kind hearted towards my fur children and I'm ready to pay for the peace of mind. My favorite vet at the clinic is a lady that actually gets down in the floor and plays with my dogs before she examines them. They love her and give her doggie kisses and she can do anything with them that she wants. A real bedside manner!!
Good luck with your endeavor,
Donna (Labmomma)