Possible Antique Scottie Jack Russell Terrier Brooch

Pictured is a Possible Antique Scottie Jack Russell Terrier Brooch. The piece is 1 1/2" x 1". The pendant portion is not attracted to magnet. As you can see in the third picture there was a newer pin glued to this little guy's back and it took me several hours but removed the newer pin to reveal original pin underneath. It appears that originally this little guy was gold plated on the original metal. Condition: Pre-Owned Patina