Pet Door

FIG. 1 is a left view of a pet door showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the figures illustrate portions of the pet door that form no part of the claimed design.