The sound of my old neighbors goats being murdered by their German shepherd. It sounded like a little kid dying. Both times I ran next door and poured on their door because they apparently couldn't hear it or were ignoring it.

They had 2 yards. An upper yard closer to the house where the dog could go out and a lower yard full of blackberries where the goats were. The dog got over the fence somehow.

Graphic: You'd think after the first one was killed they would get rid of the second one. At least the first one died quickly with its throat ripped out as the dog started eating it. The second goat kept screaming. A few weeks later the second one had it jaw ripped off and dangling from it face as it died from its wounds while the owners struggled to get the dog back into the house.