The energy loss of a test charge in an unmagnetized dusty plasma is estimated for different dust parameters (such as dust charge state, dust number density, dust charge fluctuations and dust-neutral collisions) using Krook and BGK-type collisional models. We find that the higher the dust-charge-state the more pronounced is the wake-fleld (which extends up to several Debye lengths). The variation of the dust number density shows a similar behavior. For large dust-neutral collisions a weakly damped large amplitude wake-field is observed which jumps ahead of the test charge position for higher collision frequencies. The dust neutral collisions are also found to enhance the energy loss for test charge velocities greater than the dust acoustic speeds in contrast with the dust charge fluctuations which enhances the energy loss only for test charge velocities smaller than the dust acoustic speeds.