Dog obedience

Just curious what other peoples thoughts are. We just picked our puppy up from being fixed. He’s a year old next month. He’s a very well behaved dog and is very very smart. The vet said when she tried to put the cone on him he nipped at her. She said it wasn’t vicious but she said she will not see him again unless we complete obedience school and socialize him with other people. Here’s the thing. I’m 8 months pregnant. We have a big beautiful back yard for him to run around in. He’s SO gentle with my two year old and all of his cousins. He has no problems being around any members of our family and we literally take him nowhere that there are other people. I don’t do dog parks because well we have a gigantic yard for him to run in and I don’t do other peoples dogs. We rarely have people over. He also is very good with us, he’s never even done so much as bite the leash when we put it on him. We weren’t with him when she was putting the cone on, it’s not like he’s ever seen that before and he was getting his balls chopped off so… I’d have nipped at her too??

Is it worth dog obedience school when the literal only time he’s going to need it is to go back for his shots later this year if we see her or do I just find another vet?