In 1971 von Bülow created a cartoon dog named , which he voice acted himself. Wum became the mascot of "Aktion Sorgenkind", a German humanitarian organization. During the Christmas season of 1972 Wum's song "Ich wünsch' mir 'ne kleine Miezekatze" ("I wish I had a little kittycat"), sung in sprechgesang style, became popular enough to remain in the top position of the German pop charts for nine weeks. Wum also appeared in the German show "" (The Big Prize), where he appeared during breaks until the 1990s. Before long, Wum was accompanied by the elephant Wendelin, and later by Blauer Klaus (Blue Klaus), an alien hovering in with his flying saucer. Loriot wrote, drew and dubbed all of these skits by himself. Each cartoon ended with Loriot asking the viewers to take part in the TV-lottery, which supported the "Aktion Sorgenkind". When the show was dropped, the adventures of Wum and Wendelin ended as well. Today, Wum and Wendelin appear on the last page of the TV magazine "Gong".