The ornamental design for a sanitaryguard, as shown and described.
FIG. 1 is a front perspective view of a sanitary guard showing the claimed design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a front perspective view thereof secured to an individual.
The dashed broken lines in the figures show environmental subject matter that forms no part of the claimed design. The shade lines in the figures show contour and not surface ornamentation.