Louie bolted from his owners Scott and Gabriella Robarts in North Vancouver's Princess Park around 5:30 p.m. PT. Thursday.
Gabriella says Louie became tangled up in his leash as he was being removed from the car and took off, trailing the leash and still wearing his harness.
Scott is searching the Powerline Trail thinking Louie may have taken to the nearby woods.
"He’s very shy and will shy away from strangers," says Robarts, "but he's as gentle as a mouse."
Scott says Louie will try to stay away from people and noise. He's put the word out to the local mountain bike community on the North Shore in the hope that trail riders might spot him.
The couple have had Louie for about eight months ever since adopting him from the WAG animal shelter in Whistler.
About 71 dogs were put up for adoption after a non-profit business, which had taken over another sled dog operation, shut down it as well.
Scott says he adopted Louie after hearing about the mass kill of Whistler sled dogs in 2010, which left him "really upset."
Louie is about 70 pounds with a blond coat and looks a little like a Labrador Retriever.
Anyone with any information is asked to call Scott Robarts at 778-848-6100.
MAP: Princess Park, North Vancouver, B.C.