FIG. 1 is a right side perspective view showing my new design for a retractable leash;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side, rear perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is an enlarged top view thereof; and,

FIG. 8 is an enlarged bottom view thereof.

The lettering shown in FIG. 1 forms no part of the claimed design.