The ornamental design for a Y-shaped dog toy, as shown and described.
FIG. 1 is a top plan view of my new design for an Y-shaped dog toy.
FIG. 2 is a left side elevation view of FIG. 1.
FIG. 3 is a right side elevation view of FIG. 1.
FIG. 4 is a front side elevation view of FIG. 1.
FIG. 5 is a rear side elevation view of FIG. 1.
FIG. 6 is a bottom plan view of FIG. 1; and,
FIG. 7 is a top perspective view of FIG. 1.
The evenly spaced broken lines represent stitching. The features shown in dot dashed lines in the drawing depict environmental subject matter only and form no part of the claimed design.