I drew a spline in a shape of a back leg and then extruded the back polygons along this spline (Fig.35).
I added a symmetry modifier so that everything that I did on one side was then reflected on the other side (Fig.36). I did the same thing for the front legs and in editable poly mode I extruded some polygons to make the fingers and the nails (Fig.37).
Before I started modelling the tail, I collapsed the modifier stack to get rid of the symmetry, and created the tail shape with spline (Fig.38), and extruded the back polygons along the spline, in the same way that I had done the legs (Fig.39-40). I made a very simple bone rig so I could duplicate and pose the rat in different positions (Fig.41).