Unmistakable Bu˝uel at his black and white best. Not unlike Diary of a Chambermaid (1964) and others.
For more on aristrocratic people and their need to off themselves, you might check out The Ruling Class (1972). Also note that Amores Perros (2000) replicates many of the central themes in this film. The idea that badness may not be something you can wash out of a person, or a dog. Watch both films and you'll see exactly what I mean.