The ornamental design for a canetip for the blind, as shown and described.
FIG. 1 is a front view of a cane tip for the blind; the back side view being a mirror image;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is an isometric view thereof; and,
FIG. 7 is an isometric view thereof with a cane shaft and handle in broken lines showing the cane tip for the blind in a condition of use showing how the cane tip for the blind rotates around a horizontal axis through the tubing connected to the wheels.
The broken lines depict portions of the article and environment that form no part of the claimed design.