Hathaway's probation will be served at the same time as a nine-month jail sentence he received in February for violating his extended supervision.
He was found guilty in April 2005 of felony mistreatment of an animal after he killed a horse with the intention of having sex with it. He was sentenced to 18 months in jail and two years of extended supervision on that charge, as well as six years of probation for taking and driving a vehicle without the owner's consent.
Hathaway pleaded no contest earlier this month to misdemeanor mistreatment of an animal for the incident involving the deer.
"The type of behavior is disturbing," Douglas County Judge Michael Lucci said. "It's disturbing to the public. It's disturbing to the court."