How do you hide a dog the size of a St. Bernard? Or better yet, three of them?

Mineral County sheriff's investigators want to know and have appealed to the public for help in solving the dognapping of three Great Pyrenees from a St. Regis-area home.Investigator Rose Duncan said the dogs, worth $1,500 each, were stolen sometime before Dec. 17 and that two of them were shipped from Missoula to Salt Lake City on an airplane.

But airline records don't show who bought the tickets that allowed the dogs to ride in freight compartments on the Dec. 17 flight, or who picked up the crates when they arrived in Salt Lake City, Duncan said.

The fate of the third dog is unknown.

Great Pyrenees are large, shaggy-haired dogs known for their skills in guarding sheep from predators. They are about the size of a St. Bernard and resemble Newfoundland hounds.

Duncan said investigators believe the crates used to ship the dogs were purchased in western Montana and that a veterinarian had to issue a certificate of health for the dogs before they could be shipped. But investigators have yet to find a veterinarian or a crate-seller who can shed some light on the case, she said.

Duncan asked that anyone with information about the case call the Mineral County sheriff's office in Superior.