A baby rabbit shrieking is much much worse. My lab found a nest in the yard last summer. She ran around with them in her mouth but didn't tear them apart.
Rats and mice also. I've seen a few videos of terriers killing rats, the squeaks and the way they roughly shake them so hard they die is somewhat disturbing.
Was it the video where they lifted a chicken coup up with a crane? I saw that on Reddit a couple years ago and it was insanity! Hundreds of rats came pouring out and like 10 different dogs went running in, chased all the rats down, and demolished them.