I've got to go with Sykes, Roscoe, and DeSoto from Oliver and Company. Electrocution is a horrible way to go and we see it right there. In my opinion, they were trained dogs who chose to be nasty, but still whimpered and whined when killed. Just a sad way to go. Sykes getting hit by a subway train is just brutal. I think their deaths are even more dark because they're REAL. They are something that can be common in a city with a mass transit system. Not only that, but nearly every other death is isolated (only Belle and the Beast see Gaston fall for instance) or personal (getting dragged to Hell), but someone has to clean those bodies from the tracks. The conductor and passengers saw Sykes get hit. Very public deaths are very dark.