  I review the current status of dynamical modelling of dwarf spheroidal
galaxies focusing on estimates of their dark matter content. Starting with the
simplest methods using the velocity dispersion profiles I discuss the inherent
issues of mass-anisotropy degeneracy and contamination by unbound stars. I then
move on to methods of increasing complexity, aiming to break the degeneracy, up
to recent applications of the Schwarzschild orbit superposition method. The
dynamical modelling is placed in the context of possible scenarios for the
formation of dwarf spheroidal galaxies, including the tidal stirring model and
mergers of dwarf galaxies. The two scenarios are illustrated with examples from
simulations: a comparison between the tidal evolution of dwarfs with cuspy and
cored dark matter profiles and the formation of a dwarf spheroidal with prolate
rotation.
