A creature who wants to masquerade as a creature of a different race takes a -2 penalty to Disguise skill checks according to the skill Disguise (PH 72-3). I know that kind and type (and subtype) have definitions in Dungeons and Dragons 3.5, but race is less clearly defined. I also know that while the 1st-level Sor/Wiz spell disguise self [illus] (PH 222) has the prohibition that the caster "cannot change [his] body type," no such restriction is imposed by the skill Disguise.
Does this mean the Medium juvenile male dwarf (perhaps between the ages of 75 and 124 years old) could disguise himself as an also-Medium also-juvenile also-male (yet undoubtedly sort of stubby) brass dragon (MM 70-1), and to disguise himself as such a creature the dwarf only takes a -2 penalty to his Disguise skill check?
Less specifically, what sorts of creatures can a creature disguise himself as by taking that -2 penalty to his Disguise skill check? And, if it must be addressed here, what's race in D&D 3.5?