The ornamental design for a petbowl, as shown and described.
FIG. 1 is a front, right, and top perspective view of a pet bowl, showing my 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.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a cross-sectional front view taken along and in the direction of line 8-8 in FIG. 2.
The drawings show broken lines that illustrate portions of the pet bowl. FIG. 2 show broken lines that represent the indicator of the cross-sectional view. The broken lines form no part of the claimed design.