A non alcoholic version of the salty dog usually containing vodka or gin.
"Mansfield News Journal," 18th July 1952
"George [Jessel], was fortifying himself against Republicans with a strange potion out of a champagne glass. He let me have a taste, and after bystanders had turned the fire extinguishers on me and successfully resorted to resuscitation, he explained, that this drink was a Salty Dog."
"It is a little something of my own invention," he said, "Just half fresh grapefruit juice, half vodka and a dash of salt, and you think any Democrat can win."