Vintage Dog Brooch Pin 925 Sterling Silver Marcasite & Garnet Curious Breed

Vintage Dog Brooch Pin 925 Sterling Silver Marcasite & Garnet Curious Breed. A vintage piece. A very curious looking dog marked 925. Its nobody is marcasite, itshead and tail are textured silver and he has garnet eyes and collar. Eyes may be ruby? My home detector doesn't differentiate between ruby and garnet. No pin stop. See photos for condition and size.