  We propose a model in which the origin of neutrino mass is dependent on the
existence of dark matter. Neutrinos acquire mass at the three-loop level and
the dark matter is the neutral component of a fermion triplet. We show that
experimental constraints are satisfied and that the dark matter can be tested
in future direct-detection experiments. Furthermore, the model predicts a
charged scalar that can be within reach of collider experiments like the LHC.
