My family has lived in rural Nebraska since they immigrated from Germany in the mid-1800s. Near the turn of the century, the disease was pretty rampant in the homesteading area and it killed off members of almost every family. When someone died from illness, time was of the essence in burying them as not to let the virus spread from the deceased to the living. This meant no wake periods.
So an aunt of some unknown number of "greats" preceding her relationship to me dies of some disease and she gets buried in the family cemetery on the homestead. The dogs were very fond of her so it wasn't too surprising that after the funeral the two dogs stuck near the grave.
The rest of the family began to think something of it when, a week and a half later, the dogs were still visiting her grave almost constantly. But they weren't just at the grave. They were visibly distressed, frantic, and often barking while there.
This goes on for maybe two weeks when the family decides to check it out. They dig the casket up and open it.
The deceased's hair has all been pulled out. Her fingers are raw and bloody and mangled from where, on the inside of the casket door, they can see deep scratches in the wood.
She was comatose when they buried her, and she came to while underground, spending probably her last five or so days alive in a buried casket.