The ornamental design for a retractable petleash, as shown and described.
FIG. 1 is a right front perspective view of a retractable pet leash showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The structural elements depicted by broken lines in the drawings have been shown for the purpose of illustrating portions of the retractable pet leash that form no part of the claimed design.