The Dosi Confederation was the state of the Dosi race.

The Confederation was located in the Gamma Quadrant, near the Idran star system terminus of the Bajoran wormhole. Before its conquest by the Dominion, Dosi territory was small, consisting only of the Dosa star system and its two nearest neighboring systems. The Dosi homeworld was Dosa II, and its capital was Relxer-D. (Last Unicorn RPG module: Star Trek: Deep Space Nine Core Game Book; ST reference: Star Charts)

The Dosi established trade relations with the Vorta in the mid-to-late 23rd century (over a hundred years before 2378). (ST reference: Star Charts)

However, the Dosi were then conquered by the Jem'Hadar at some point in their past, and became subjects of the Dominion. (Last Unicorn RPG module: Star Trek: Deep Space Nine Core Game Book)

By 2370, however, they were not very important within the Dominion, and knew very little about it, though they had business dealings with the Karemma. (DS9 episode: "Rules of Acquisition")

By 2378, the Dosi Confederation was allied to the Dominion. (ST reference: Star Charts)

The Star Trek: Deep Space Nine Core Game Book states that the Dosi were subjects of the Dominion, while Star Charts says they were allied to the Dominion. It is not clear if this alliance represents a proper alliance, or is simply a term for Dominion control.
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