when did pluto lose its classification as a proper planet
Pluto Pluto was discovered by Clyde Tombaugh in 1930 and was originally considered to be the ninth planet from the Sun. After 1992, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, a dwarf planet in the scattered disc which is 27% more massive than Pluto, was discovered. This led the International Astronomical Union (IAU) to define the term "planet" formally in 2006, during their 26th General Assembly. That definition excluded Pluto and reclassified it as a dwarf planet.
Pluto (Disney) Unlike Mickey's other animal friends, such as Goofy (who is also a dog), Pluto is a normal animal. Pluto does not speak, walk upright, or wear clothing. A significant departure from this was his speaking role in The Moose Hunt (1931), which was produced before Pluto's characterization had been clearly defined. As Pluto made more appearances, it became common that he would not speak, but only vocalize in barks and grunts. Other ways of communicating Pluto's thoughts occur through his facial expressions, and sometimes through the use of a shoulder angel/devil who speak directly to Pluto. (Mickey's Elephant, Lend a Paw).