Rare set of Art Deco Bakelite Scottie Dog Napkin rings with eyes and on wheels

Rare Art Deco  Black Bakelite Scotty Napkin Rings with red eyes and each with 4 roller wheels to legs. All in perfect condition, all eyes intact and no damage, no chips or scratches; only a soft age patina from careful use over many decades. Amazing to get a complete set of 4, in perfect condition. These are rare with both eyes and wheels.  Dimensions approx.: Nose to tail 8cm wide x 8.3cm high rollers to ears x 2.8cm deep across “axles”. U.S.A.. Circa 1930’s.