  We use deep far-IR, submm, radio and X-ray imaging and mid-IR spectroscopy to
explore the nature of a sample of Spitzer-selected dust-obscured galaxies
(DOGs) in GOODS-N. A sample of 79 galaxies satisfy the criteria R-[24]>14
(Vega) down to S24>100 microJy. Twelve of these galaxies have IRS spectra
available which we use to measure redshifts and classify these objects as being
dominated by star formation or active galactic nuclei (AGN) activity in the
mid-IR. The IRS spectra and Spitzer photometric redshifts confirm that the DOGs
lie in a tight redshift distribution around z~2. Based on mid-IR colors, 80% of
DOGs are likely dominated by star formation; the stacked X-ray emission from
this sub-sample of DOGs is also consistent with star formation. Since only a
small number of DOGs are individually detected at far-IR and submm wavelengths,
we use a stacking analysis to determine the average flux from these objects and
plot a composite IR (8-1000 microns) spectral energy distribution (SED). The
average luminosity of these star forming DOGs is LIR~1e12 Lsun. We compare the
average star forming DOG to the average bright (S850>5 mJy) submillimeter
galaxy (SMG); the S24>100 microJy DOGs are 3 times more numerous but 8 times
less luminous in the IR. The far-IR SED shape of DOGs is similar to that of
SMGs (average dust temperature of around 30 K) but DOGs have a higher mid-IR to
far-IR flux ratio. The average star formation-dominated DOG has a star
formation rate of 200 Msun/yr which, given their space density, amounts to a
contribution of 0.01 Msun/yr/Mpc3 (or 5-10%) to the star formation rate density
at z~2. We use the composite SED to predict the average flux of DOGs in future
Herschel/PACS 100 micron and SCUBA-2 450 micron surveys and show that the
majority of them will be detected.
