That Famous Cask The monks of the famed St. Bernard Hospice say that no St. Bernard of theirs ever had casks of brandy around their necks. It is thought the famous painting by Sir Edwin Landseer (in 1820, "Alpine Mastiffs Reanimating a Distressed Traveller" was the start of that myth. Here's the Wiki link.
Saint Bernards have a well-deserved reputation as guardians, gentle watchdogs, and saviors of lost travelers. Hundreds of years of breeding for the heightened scenting ability to find snow-covered travelers make the ability to sniff scents critically important to your dog.
Even if your St. Bernard has never seen snow, his nose is still his main way of gathering info.