The ornamental design for pet feeder, as shown and described.
FIG. 1 is a front perspective view of a pet feeder in accordance with our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is an enlarged view of a central portion of the rear view shown in FIG. 3;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is an enlarged view of a lower right portion of the right side view shown in FIG. 6;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
The shading lines on extending floor panel of the pet feeder in FIGS. 1, 6 and 7 indicate a flat surface. The broken lines, which show portions of a pet feeder, form no part of the claimed design.