Pet Water Fountain

FIG. 1 is a top, front, right perspective view of a pet water fountain of my new design; FIG. 2 is a bottom, back, left side perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left view thereof; FIG. 6 is a right view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom view thereof; FIG. 9 is an exploded top, front, right perspective view of the pet water fountain; and, FIG. 10 is an exploded bottom, back, left perspective view of the pet water fountain. The broken lines in the drawings depict portions of the pet water fountain that form no part of the claimed design.