The ornamental design for a dock, as shown and described.
FIG. 1 is a perspective view taken from the front and above a dock;
FIG. 2 is an enlarged fragmentary view of a portion of the dock of FIG. 1;
FIG. 3 is a cross sectional view taken along line 3-3 in FIG. 1;
FIG. 4 is a perspective view taken from the front and below the dock of FIG. 1;
FIG. 5 is a left side elevation view of the dock of FIG. 1;
FIG. 6 is a front elevation view of the dock of FIG. 1;
FIG. 7 is a right side elevation view of the dock of FIG. 1;
FIG. 8 is a rear elevation view of the dock of FIG. 1;
FIG. 9 is a top plan view of the dock of FIG. 1; and,
FIG. 10 is a bottom plan view of the dock of FIG. 1.
The claimed design is shown broken away to indicate that a specific length forms no part of the claimed design. Portions of the drawings shown in broken lines are to illustrate portions of the article and form no part of the claimed design.