Well I was a Pennsylvania hunter for many of my younger years and we always unloaded our guns and laid them on the other side of the fence before we climbed through. This practice kept us whole so we could enjoy a fried rabbit dinner.
A game warden around here told me about a hunter who "got his foot shot nearly off by his dog". He laid the gun under the fence without unloading it. He crossed the fence in front of the muzzle. The dog was already across the fence, and stepped on the gun. Apparently one toe pushed the cross-slide safety off while another toe on the same paw went inside the trigger guard bow and forced the trigger back causing the gun to fire just as the hunter's foot came down in front of it.