I had the same dilema when I first got Millie. In the end I chose not to take Millie before she was fully vaccinated, because the training classes were outdoors. And I was advised not to join in. Wish I had really, nothing like getting on with the training. Its also very unusual for a puppy not to be vaccinated and I doubt those that aren't will be in puppy classes.
However because Millie had to have a third vaccination due to the breeder giving one make and the vet giving another make (I worked this out only recently thanks to Turi) she was not allowed up until nearly 13 weeks. I actually took her out one weekend , carrying her most the time and putting her down to go to the loo., before her final vaccination, the vet wasn't impressed. I decided they were being overly fussy.
However because Millie had to have a third vaccination due to the breeder giving one make and the vet giving another make (I worked this out only recently thanks to Turi) she was not allowed up until nearly 13 weeks. I actually took her out one weekend , carrying her most the time and putting her down to go to the loo., before her final vaccination, the vet wasn't impressed. I decided they were being overly fussy.