The ornamental design for a dog chew, as shown and described.
FIG. 1 is a top, right, front view of a dog chew in accordance with the new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side elevational view thereof, the right side elevational view being a mirror image thereof;
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a front elevational view thereof.
The evenly-spaced broken lines in FIGS. 1-6 illustrate portions of the dog chew that form no part of the claimed design. The dash-dot-dot broken lines in FIGS. 1, 3, 5, and 6 illustrate the boundary of the claimed design which forms no part thereof.