  Recent lattice QCD simulations of the scattering lengths of Nambu-Goldstone
bosons off the $D$ mesons are studied using unitary chiral perturbation theory.
We show that the Lattice QCD data are better described in the covariant
formulation than in the heavy-meson formulation. The $D^*_{s0}(2317)$ can be
dynamically generated from the coupled-channels $DK$ interaction without
\textit{a priori} assumption of its existence. A new renormalization scheme is
proposed which manifestly satisfies chiral power counting rules and has
well-defined behavior in the infinite heavy-quark mass limit. Using this scheme
we predict the heavy-quark spin and flavor symmetry counterparts of the
$D^*_{s0}(2317)$.
