A man came home from work to a horrifying discovery. The rescue dog he and his wife had adopted just days earlier from a Las Vegas animal shelter had killed her. A recording of the man’s 911 captures his heartbreak over the death of 58-year-old Susan Sweeney. The dispatcher asks him, “Do you think she’s beyond help?” The man replies, “Yes.” A dog that may seem friendly in a shelter can act differently once it’s in a new home, veterinarian Jeff Werber says.