The ornamental design for a waterspraypool for dog, as shown and described.
FIG. 1 is a first perspective view of a water spray pool for dog 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;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is an enlarged view of the selected portion 9 in FIG. 2.
The evenly spaced broken lines in the drawings depict portions of the water spray pool for dog that form no part of the claimed design. The unevenly spaced broken lines in the drawings define the boundary of the enlarged portion shown in FIGS. 2 and 9.