Horror movie about three wicked sisters and their equally unsavory husbands who all arrive at a remote inn where they mean to attend the reading of their uncle's will. One by one, the heirs are dispatched by an unknown killer.
In the 1971 movie (there are at least 2 movies with this title--this is the one with John Carradine), Chin the dog is seen walking away from the house while his owner goes after him. She finds him dead in the pond shortly after.