The ornamental design for a dovetail saw, as shown and described.
FIG. 1 is a perspective view of the dovetail saw.
FIG. 2 is a right side elevation view of the dovetail saw shown in FIG. 1, the left side elevation view being a mirror image of the right side elevation.
FIG. 3 is a top plan view of the dovetail saw shown in FIG. 1.
FIG. 4 is a bottom plan view of the dovetail saw shown in FIG. 1.
FIG. 5 is a front elevation view of the dovetail saw shown in FIG. 1; and,
FIG. 6 is a back elevation view of the dovetail saw shown in FIG. 1.