I'm with you, OP. I couldn't stomach the idea of zapping my dog for following their instinct. Even if it worked, I was going to end up with a dog who would rather run away from me, and was just afraid to.
I dove into the world of positive reinforcement training, and with a little cheese and a lot of practice, I have a very prey driven dog that I can take hiking off leash in the woods, who returns to me willingly, happily, and repeatedly during our jaunts.
There are other options beyond shock collars!