Authorities are looking for a missing veterinarian from Las Vegas. Shawn Frehner was reported missing near Lake Mead on Monday. The Nye County Sheriff's Office had been investigating him for alleged animal cruelty. Last week, a Pahrump resident filed a criminal complaint against Frehner, claiming he mistreated her horse. Authorities with multiple agencies were searching for Frehner in Lake Mead National Recreation Area on Monday afternoon, using aerial, marine and ground personnel.