Washington State Patrol troopers say a semi-truck was attempting to change lanes Tuesday morning when it hit a motorhome, injuring three people inside.
Donald and Patricia Rodgers of Shelton and their 18-year-old assistant Debra, were on their way back to Shelton from a California dog show when the wreck happened.
Patricia was airlifted to Harborview Medical Center, where she remains in serious condition. Donald was taken to Centralia Providence Hospital, but was released later on Tuesday.
"It's been a horrifying day. It's every professional handler and every show person's worst nightmare ever," said family friend Angela Allen.
Several dogs were inside the motor home during the crash. Most made it through the violent incident unharmed, but one dog -- a whippet named Steeler -- is still missing.
Volunteers spent the day searching for the dog along I-5, but have so far come up empty.
"It's really hard," Allen said. "You're literally looking for a needle in a hay stack and any kind of glimpse is what you hope for."
Handlers say anyone who spots the dog should be careful not to spook him. They also say Steeler responds to whistling.
Troopers are still investigating the crash. The driver of the semi-truck was not injured.