Satomi's Dogs are 8 magical crystal balls. They are orange and spangled with glowing red stars. They are said to "give life".
In the 1940s, Gellert Grindelwald (canon) owns 7 of the 8 balls. He uses them to channel the magic of the ley line on which Nurmengard (canon) is built. The 7 balls are destroyed by Limpel Tineagar to weaken Grindelwald during the attack on Nurmengard on April 30th, 1945.