In the last decades it has been revealed that dark matter haloes extend far beyond the optical boundaries of galaxies. However, their actual ?sizes ? and, above all, their density distribution outside the luminous regions, are still quite unknown. We use satellite galaxies as dynamical probes to study the distribution of dark matter haloes out to very large radii. Using VIMOS at the VLT we carried out a spectroscopic survey around seven late-type isolated spiral galaxies. We investigate the kinematics of these spirals, and the radial and angular distribution of the satellites.