A man recently released from a mental institute inherits a mansion after his parents die. After a series of disturbing events, he comes to believe it is haunted.
Timestamp of 6:45, there is a scene where he dog is shown growling at the protagonist, in which he shakes the vision off. When he opens his eyes, the dog is gone. The protag then asks what happened to his father's dog, in which he is told the dog was put down Thursday (before he got there). No dog death is seen on screen and is only mentioned.
There's a really cute plushie of a doberman and somewhere through the film, the eyes have been pulled off of it. You don't see it happen on screen, only the aftermath, but as someone who can't see damage happen to stuffed animals it was uncomfortable.
After the main character sees a dog walking through the house around 20 minutes in, when he follows it we can hear the dog eating a body for a little bit. Wet noises and bone crunching.
The protag is talking with another one of the characters in an in-depth conversation. She then shows self-harm marks on her arm that are some-what recent.