FIG. 1 is a perspective view of a pet backpack, showing my new design;
FIG. 2 is another perspective view of the pet backpack shown in an open and expanded alternate configuration;
FIG. 3 is another perspective view of the pet backpack of FIG. 1;
FIG. 4 is a front view of the pet backpack of FIG. 1;
FIG. 5 is a rear view of the pet backpack of FIG. 1;
FIG. 6 is a left side view of the pet backpack of FIG. 1;
FIG. 7 is a right side view of the pet backpack of FIG. 1;
FIG. 8 is a top plan view of the pet backpack of FIG. 1; and,
FIG. 9 is a bottom plan view of the pet backpack of FIG. 1.
The broken lines show portions of the pet backpack that form no part of the claimed design.