2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231521A simple mid-infrared-to-optical color criterion of R-[24]>14 Vega mag results in a robust selection of approximately half of the redshift 2 ultraluminous infrared galaxy (ULIRG) population. These `Dust-Obscured Galaxies', or DOGs, have many properties that suggest that they are good candidates for systems in a transition phase between gas-rich mergers and QSOs.To appear in proceedings of "The Starburst-AGN Connection Conference", Oct 27-31 2008, Shanghai (ASP Conference Series). 6 pagesCosmology and Nongalactic Astrophysicstext