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Joey Peterson wore pajamas when walked away from his house near the area of Hat Six Road and Goose Creek Road between 11 p.m. and 12 p.m. Sunday, Nov. 1.

The Natrona County Sheriff's Office said search efforts include tracking experts, search dogs, mounted searchers and drones.

Two new search dog teams were being used Monday, with another pair possibly on the way.

The search area has expanded to 228 square miles by law enforcement, drones and trained search personnel, he said.

Experienced mounted search and rescue crews are working with Natrona County sheriff's deputies to search technically difficult terrain.

Peterson is 5'9" and weighs 120 lbs. He was last seen wearing a red hooded sweatshirt and pajama pants.

Beginning at noon Sunday, a task force consisting of 10 city, county, state and federal agencies has been taking part in the search.

Anyone with information on Mark Strittmater is asked to contact the sheriff's office at 307-324-2776.

He did not return home by Sunday evening, and a report was filed with the sheriff's office.

He was last seen wearing a black baseball cap with a white logo, a blue or black long-sleeved plaid shirt and blue jeans.