54-year-old Larry McElroy, of Leesburg, Georgia, shot an armadillo with his 9mm handgun while standing outside his mobile home.
The bullet ricocheted off the animal's armor, went through the back door of the mobile home and into the back of a recliner where McElroy's mother-in-law was sitting.
74-year-old Carol Johnson was struck in the back. She was taken to the hospital with non-life threatening injuries.
"The whole situation was unusual," said the county sheriff.
Residents are allowed to shoot armadillos as a way to get rid of them and McElroy will not be charged for the shooting.