His post was shared more than 2,400 times as the family spent days searching for her - calling animal control, notifying the town, and asking neighbors for help.
Finally, on Jan. 9, Silver gave an "exciting update."
"Yup it's a miracle," he wrote on Facebook. "Sophie has been found alive and well. She spent 5 days in extreme cold and winds and in the snow."
Silver said someone plowed a path to rescue her after seeing her head above the snow.
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Sophie lost 5 pounds while she was out, but Silver said a trip to the vet showed she was otherwise healthy.
Silver said Sophie will be "ridiculously spoiled for the rest of her days."