The ornamental design for a chew toy for pet, as shown and described.
FIG. 1 is a front view showing my new design for a chew toy for pet, the portions shown in dotted lines are for illustrative purposes only, forming no part of the claimed design;
FIG. 2 is a rear view thereof, the portions shown in dotted lines are for illustrative purposes only, forming no part of the claimed design;
FIG. 3 is a top view, the bottom view being a mirror image thereof; and,
FIG. 4 is a right side view, the left side view being a mirror image.
The portions shown in broken lines are for illustrative purposes only and form no part of the claimed design.