Specifically in the "A Woman's Lot" DLC the main character's dog, Tinker, is killed by a man with an axe in the last scene of the DLC and cannot be avoided. The death happens off-screen but you do see Tinker's deceased body (with no gore other than blood).
In the quest where you raid Pribyslavitz, after the fight with Runt (bald guy who took your sword), Henry vomits while everyone else is talking. I muted the game and covered everything but the captions so I could still get any story dialogue. AFTER Radzig says "That's the fear leaving you, let it out", it's safe to watch.
The protagonist becomes unconscious a few times in the beginning of the game. Non-player characters can also be strangled unconscious in their sleep at the players discretion.