The yellow lab mix was found riding a train on the New York commuter line.
Police figure the dog was frightened by severe weather Tuesday night and jumped onto the train.
Authorities are trying locate the family of the friendly dog.
Pat Rosen, of Long Island Veterinary Specialists, says the 85-pound pooch is a "lovey."
Rosen adds the dog leans in for cuddling and kisses.
The mysterious mutt is now at a local shelter.