The ornamental design for a petbed, as shown and described.
FIG. 1 is a perspective view of a pet bed according to the present invention;
FIG. 2 is a front view of the pet bed of FIG. 1;
FIG. 3 is a right side view of the pet bed of FIG. 1, the left side view being a mirror image thereof;
FIG. 4 is a back side view of the pet bed of FIG. 1;
FIG. 5 is a top view of the pet bed of FIG. 1; and,
FIG. 6 is a bottom view of the pet bed of FIG. 1.
The broken lines in FIG. 6 immediately adjacent the shaded areas or the solid lines represent the bounds of the claim, and the broken lines and the area within the broken lines represent unclaimed portions of the present invention. None of the broken lines form a part of the claimed design.