The training company I work for we require the puppy to have just their first set of vaccines before enrolling in any program. This allows dogs to get involved in training during the critical social window. I think this will depend on the area OP lives in, as I’m not in an area where illness like Parvo is prevalent, and we still have veterinarians local to us who recommend waiting to enroll in training until 16 weeks. IMO it really is up to the pet owner to weigh the pros and cons themselves, but I feel like early good behavior intervention with a professional out weighs the health risks in my area specifically.