The chickens do get shocked, but they learn very quickly. When I set up and turned on my fence, I stayed out there with them for an hour or two to make sure nobody got stuck. Out of 20 chickens, I only had 1 that panicked badly, and kept trying to run through the fence, get shocked again, try to run through the fence, get shocked etc. I had to scare her away from the fence to end the shocking ordeal! But everyone quickly learned not to touch the fence. After a day, no one gets shocked. But it allows them to free range in relative safety. I say relative as a fence does nothing to protect against hawk and eagles, and I lost a rooster when he flew over the fence to challenge a predator and lost.