The ornamental design for a pettreat, as shown and described.
FIG. 1 is a rear, top, right side perspective view of a pet treat according to the invention;
FIG. 2 is a front, bottom, right side perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a left side elevation view thereof.
The broken lines in FIGS. 1-7 illustrate the boundary of the claimed design which forms no part thereof. The de-emphasized and half-tone portions illustrate portions of the pet treat that form no part of the claimed design.