  We consider the bremsstrahlung and model-dependent contributions to the
radiative decay $\tau^- \to \pi^-\pi^0\nu_{\tau}\gamma$ in the context of a
meson dominance model. We focus on several observables related to this decay,
including the branching ratio and the photon and di-pion spectra. Particular
attention is paid to the sensitivity of different observables upon the effects
of model-dependent contributions and of the magnetic dipole moment of the
$\rho^-(770)$ vector meson. Important numerical differences are found with
respect to results obtained in the framework of chiral perturbation theory.
