WHITE PLAINS, N.Y. — A man who killed his girlfriend’s dog by snapping its spine will be spending a year behind bars.

The Westchester County district attorney’s office says 21-year-old Jonathan King of Yorktown was sentenced Tuesday to a year in prison and a year of probation.

King admitted in March that he killed Libra, a Yorkshire terrier mix, last year by yanking its collar hard enough to dislocate its head from its spine. Prosecutors said there was no apparent motive.

The dog’s body was found behind a clothes dryer. King was identified when DNA analysis determined that blood found beneath the dog’s claws was his.