Dog trainer

FIG. 1 is a perspective view of a dog trainer showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view thereof.

The dashed or broken lines shown in the drawings depict portions of the dog trainer in which the design is embodied that form no part of the claimed design.