The ornamental design for a petwaterdispenser, as shown and described.
FIG. 1 is a first perspective view of a pet water dispenser showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown in the drawings depict portions of the pet water dispenser in which the design is embodied that form no part of the claimed design.
The oblique shading lines in FIGS. 1-7 are included to denote the transparent quality of the surface planes on the pet water dispenser.