Pet Toothbrush

FIG. 1 is a top-front-left perspective view of a pet toothbrush showing my new design;

FIG. 2 is a bottom-rear-right perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left-side elevational view thereof, the right-side elevational view being mirrored thereto;

FIG. 6 is an enlarged top plan view thereof; and,

FIG. 7 is an enlarged bottom plan view thereof.

The broken lines in the drawings depict boundary lines of the pet toothbrush and form no part of the claimed design.