Killdeer has dropped four straight contests since picking up a 3-0 sweep over New Town at home.
Since then, Killdeer lost to New England, Stanley and Bowman County.
The Cowboys also added the Richardton-Taylor Raiders to the list of losses Tuesday when they fell by a 3-2 margin.
The Cowboys will play in the two-day volleyball tournament, starting Friday in Dickinson.
The Killdeer Cowboys (0-3) will next host Beach (1-2) at 7 p.m. on Oct. 1.