The ornamental design for a vehicle side guard, as shown and described.
FIG. 1 is a rear elevation view the vehicle side guard showing my new design;
FIG. 2 is side elevation view thereof;
FIG. 3 is a reduced scale rear elevation view thereof showing only the pipe portion;
FIG. 4 is a reduced scale rear perspective view thereof installed on the left side of a vehicle;
FIG. 5 is an enlarged top perspective view thereof showing the bottom end;
FIG. 6 is an enlarged bottom perspective view thereof showing the bottom end; and,
FIG. 7 is an enlarged rear perspective view thereof showing the top end.
The broken lines in the drawings illustrate portions of the vehicle side guard and environmental structure of a vehicle that forms no part of the claimed design.