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).