The ornamental design for a petcarrier, as shown and described.
FIG. 1 is a perspective view of a pet carrier showing the new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The thick dash broken lines in the drawings illustrate stitching that form no part of the claimed design. All other broken lines illustrate portions of the pet carrier and form no part of the claimed design.