Hunting Dog Training

I’ve enrolled my dog (6 year old mixed breed) in training classes at Petsmart. I need to know which treats to bring though. They just told us to bring treats, but didn’t give any recomendations. He likes soft treats, but I’m looking for something extra special that he will want to work for. They have to be small so he can eat them quickly too. Any suggestions?

I was looking into it and was wondering if there are any pros and cons from people who have used it. Thanks!

What does the collar do if not a shock? Is it worth $60.00? I have a new puppy! Any help would be appreciated. Thanks!