If dark matter couples predominantly to the axial-vector currents with heavy
quarks, the leading contribution to dark-matter scattering on nuclei is either
due to one-loop weak corrections or due to the heavy-quark axial charges of the
nucleons. We calculate the effects of Higgs and weak gauge-boson exchanges for
dark matter coupling to heavy-quark axial-vector currents in an effective
theory below the weak scale. By explicit computation, we show that the
leading-logarithmic QCD corrections are important, and thus resum them to all
orders using the renormalization group.