Yes. The corpse of a dog is shown floating in a river toward the end of the movie. There is also dialog halfway through the movie discussing a dead dog, but this is separate from the dead dog shown toward the end. There are two cuts of the movie, and the dog corpse is in the uncut version for sure.
(SPOILER?) The husband desperately wants to know where the wife's "lover" lives, so he gets a private detective on the case. The detective then follows and stalks the wife.
Whether or not they were actually possessed is up for debate, but either way, if you are triggered by possession, I would not recommend watching this movie
1:18:00 to 1:18:31 - at the end of the subway scene, after she rolls around in the milk, it cuts to her kneeling with white liquid coming out of her mouth. As well as blood and green liquid coming out of her other orifices. No projectile.
1:33:25 to 1:33:43 - after Heinrich says “if you’ve only seen what I saw,” he runs to the sink. no direct visual, only see him hunched over the sink.
1:34:30 to 1:34:53 - after Mark lifts the toilet lid off, he sticks a feather down his throat and gags. no direct visual only see him stick his head in the bowl.
Anna cuts her own neck with an electric knife. The wound is not deep and she survives. She is shown with a bandaged neck for several scenes following this.
There is so much screaming. A good majority of the film involves Mark and Anna yelling at each other, and Anna's infamous "subway scene" features her screaming almost the entire way through.
Heinrich's mother takes a lethal dose of pills after figuring out he is dead. Mark is grievously wounded and drags himself off a stairwell falling several stories to his death in one of the final scenes of the movie.
Lots of blurred lines in this movie. There are moments of struggle against kissing/touching, and it's also very clear that the character is unable to consent because of her frame of mind (insanity/supernatural forces). There is a scene depicting sex with a supernatural being. I'm not sure if it's consensual. It is disturbing, though.