there are some animal bones found under a house. it is not clear if it's dog or not although there is a dog house on the same property. no dogs are killed on screen nor implied to be killed.
there's talks of compartmentalization, imaginary friends, and a scene where in of the characters is "zoned out" with a greyer hue to the scene than the others. aside from this there's nothing explicit.
Not shown on screen but in the very first area you are in you can interact with a broken plate and certain dialouge choices tell a story akin to domestic violence.
The opening scenes take place in the house of the main characters grandmother who suffered from and may have passed from dementia. We don't see the grandmother on screen but do walk her house after an estate sale.