This featured series was first partly documented by Irene Thornburg in her first book of salt & pepper shaker series called "Collecting Salt & Pepper Shaker Series" in 1998 on page 46. She photographed the pigs, dogs, rabbits, and squirrels pictured below.
Now two additional sets have been found - mice and cats. They are all stamped green "Japan". They all stand about 3'' high with 5 and 3 pour holes. And of course they look similar with clothing, cocked heads, holding personal items, and same shaped eyes.