Playful pup looks like a Border Terrier. Head has cork on the underside that fits into the bottom half of the decanter, the dog's body.
Height: 5 3/4"
Length: 4 1/2"
No makers mark, some pencil writing on bottom.
Good vintage condition: flea bite on inner rim of bottle neck; some crazing, and a fine hairline crack (under the glaze) traversing the chest.