The crash Saturday that killed an Iowa Boy Scout leader and one of three Scouts on a trip with him in the town of Verona was caused by a dog jumping into the lap of a man driving a motor home, the Dane County Sheriff’s Office said Monday.

The dog created a distraction for the driver of the motor home, sheriff’s spokeswoman Elise Schaffer said, causing him to cross the median.

The motor home struck an Oldsmobile SUV driven by Scout leader John W. Seier, 55, of Dubuque, who was killed along with front seat passenger Travis Brune, 13, a Boy Scout from LaMotte, Iowa, Schaffer said.

Another Scout who was in the back seat was pinned in the SUV and was critically injured but is expected to survive, Schaffer said. A third Scout, also in the back seat, was injured but the extent of his injuries was not available.

The driver of the motor home, Gary A. Boldt, 62, of Pewaukee, and a passenger also suffered non-life-threatening injuries in the crash that occurred at about 11 a.m. near Highway G.