  We investigate Type-I Seesaw models where the right-handed neutrino masses
are dynamically generated by strong interactions. Using horizontal gauge
symmetry as the source of strong dynamics, a nontrivial flavor structure can
also be introduced dynamically. We find that the right-handed neutrino mass
matrix with a strongly anti-diagonal structure emerges when the three
right-handed neutrinos are in the triplet representation of $SU(2)_H$
horizontal gauge symmetry. With an assumption of a Dirac neutrino mass matrix
with hierarchical eigenvalues and small mixing angles, analogous to the up-type
quark sector, and certain substructures, the resulting light neutrino mass
matrix from the type-I seesaw mechanism can accommodate the large mixing and
weak hierarchy observed in low-energy neutrino data. The neutrino puzzles can,
therefore, be understood as the consequence of strong horizontal gauge
interactions. We also discuss the potential UV completion and the phenomenology
that could be tested in the future.
