According to the Star Trek: Star Charts (pgs. 70, 74), Dosi, the Dosi homeworld, was a Class M planet in the Dosi system. The official name of the planet's government was the Dosi Confederation. This world was allied with the Dominion. The planetary capital was Relxer-D. Dominant species was the humanoid Dosi. In 2378, there were an estimated 1.5 billion Dosi living on this planet. It was not known when the Dosi became warp-capable. The Dosi established trade relations with the Vorta in the late 23rd century.
The Dosi system was located in or near Dominion space. This system was a single star system. Primary was a Class M star with a magnitude of +9. This system was a destination on the Gamma Quadrant Bio-Survey (2369-75).