A trip to the vet

Since I have Dory signed up for dog training classes, she needed to be up to date with her shots. Since she was a rescue dog we don't know if she ever had shots. So I took her into the vet today to get up to date. Well she like being there BUT did not like the shots. First shot she yelped and growled so the tech gal went and got an extra tech to hold Dory and I got to leave the room. Well she tried to bite him, so they put a muzzle on her. Which worked out fine. Once that was all done she was fine. They gave me some happy pills for her next trip. She growled at a few dogs, so now I'm concerned how she will behave at the training class. I might have to use the claw collar if they approve, then she won't pull so hard and might behave better. I hope this training stuff works, because she really needs it.