  As a simple model for dark matter, we propose a QCD-like theory based on
$\rm{SU}(2)$ gauge theory with one flavor of dark quark. The model is confining
at low energy and we use lattice simulations to investigate the properties of
the lowest-lying hadrons. Compared to QCD, the theory has several peculiar
differences: there are no Goldstone bosons or chiral symmetry restoration when
the dark quark becomes massless; the usual global baryon number symmetry is
enlarged to $\rm{SU}(2)_B$, resembling isospin; and baryons and mesons are
unified together in $\rm{SU}(2)_B$ iso-multiplets. We argue that the lightest
baryon, a vector boson, is a stable dark matter candidate and is a composite
realization of the hidden vector dark matter scenario. The model naturally
includes a lighter state, the analog of the $\eta^\prime$ in QCD, for dark
matter to annihilate into to set the relic density via thermal freeze-out. Dark
matter baryons may also be asymmetric, strongly self-interacting, or have their
relic density set via $3 \to 2$ cannibalizing transitions. We discuss some
experimental implications of coupling dark baryons to the Higgs portal.
