The ornamental design for a pettowel, as shown and described.
FIG. 1 is a front perspective view of a pet towel showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines representing the closure fastener in FIGS. 1 through 3 have been provided for the purpose of illustrating portions of the claimed pet towel that form no part of the claimed design.
The dashed lines in FIG. 3 are understood to represent stitching.
The cross-hatched pattern in the views is understood to be continuous throughout the surfaces to which it is applied.