My idea is that the puppy has to be current on all the shots which means that it should have all the shots due to be done by 11 weeks.
I also remember that my breeder told me not to let my puppy out before a certain age because it is more susceptible to getting infected. Thus, it is not about a fear that the dog is not going to be social or afraid because, most likely, it won't be since all of our dogs are tiny creatures not much larger than your puppy. It is more about making sure that the puppy is not contagious to others and not immuno-deficient.
I know that I registered my dog for puppy classes when she was 14 weeks. At the same time, Anti-Cruelty asks that the dog be at least 8 weeks to 14 weeks to attend a puppy class. So, I suppose that your dog is eligible for their socialization.
If I was you, I would either call the doctor or make sure that the dog is current on Distemper shot - this is the major one at his age. Rabbies is the second big one but he is OK not to have it until 4 months or 16 weeks of age.
Hope it helps.
Milena |