3 yr old pure bred neutered male Jack Russel terrier

He's great with kids of all ages and other dogs. Has never nipped or growled, he tolerates my 18 month so well. He's used to cattle and doesn't chase cats. He's up to date on his vaccinations. Only needing to re-home because he recently started killing our chickens. Despite trying all the tricks in the book we can't get him to stop. Small rehoming fee to ensure a good home.