The ornamental design for a petwaterfountain, as shown and described.
FIG. 1 is a perspective view of a pet water fountain showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines throughout the drawing figures depict portions of the pet water fountain that form no part of the claimed design.
The oblique shading lines in the drawings are included to denote the reflective quality of surface planes on the pet water fountain.
The pet water fountain includes symbolic breaks along the length of the power cord in FIGS. 1-3 and 6-7. The area between the break lines forms no part of the claimed design.