i dont know about all dwarf planets but pluto is
lots
dwarf planets are called dwarf planets because they are too small to be classified as an actual planet. Pluto is a dwarf planet as well as Xena and Ceres. Which you probably do not know of because we do not study them as main planets in our solar system.
There are currently five dwarf planets recognised; Ceres, Pluto, Makemake, Haumea and Eris.
There are 8 planets that are not considered dwarf planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
8 planets and 5 dwarf planets, so 13 in total. There are some additional dwarf planet candidates that have not been officially categorised yet.
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There are 13 in total (as of February 2013) including ALL the 5 dwarf planets!
The other planets are not similar to dwarf planets.
Well, dwarf planets are much much smaller than planets and some people may confuse some of Jupiter's largest moons as dwarf planets but because some people may look at the moons and confuse them with dwarf planets (i know someone who dose) !!
our dwarf planets are Pluto
dwarf planets are smaller than regular planets