I claim the ornamental design of a dock ladder, as shown and described.
FIG. 1 is a front view of the dock ladder design of the invention depicting the dock ladder in its deployed configuration.
FIG. 2 is a left side view of the dock ladder design of the invention depicting the dock ladder in its deployed configuration.
FIG. 3 is a top view of the dock ladder design of the invention depicting the dock ladder in its deployed configuration.
FIG. 4 is a perspective view showing the top, front, and right side of the dock ladder design of the invention depicting the dock ladder in its deployed configuration.
FIG. 5 is a perspective view showing the bottom, front, and left side of the dock ladder design of the invention depicting the dock ladder in its deployed configuration.
FIG. 6 is a left side view of the dock ladder design of the invention depicting the dock ladder in its stowed configuration.
FIG. 7 is a perspective view showing the rear, top, and left side of the dock ladder design of the invention depicting the dock ladder in its stowed configuration; and,
FIG. 8 is a perspective view showing the front, top, and left side of the dock ladder design of the invention depicting the dock ladder in its stowed configuration.