Yes, unfortunately, the dog in It Comes at Night does die.
Stanley's Pivotal Role and Tragic End
The dog in It Comes at Night is named Stanley and belongs to Travis. Stanley's unexpected return to the isolated home at night serves as a significant turning point in the film's narrative. While it's not explicitly clear who opened the door to let him inside, his reappearance from the outside world acts as a catalyst, inadvertently introducing the very threats and dangers the family has been trying to escape.
Stanley's presence after being absent from the secluded house is directly linked to the escalation of conflict and the tragic events that follow. His return ultimately brings death and destruction to the family, confirming that this is one of those films where the beloved pet does not survive. His fate is a grim indicator of the fragile security within the home and the inevitable infiltration of the harsh realities from beyond its walls.