FIG. 1 is a top view of a pet cage in accordance with the invention.
FIG. 2 is a left front perspective view thereof.
FIG. 3 is a front view thereof, the back view is identical to the front view.
FIG. 4 is a bottom view; and,
FIG. 5 is a right side view thereof, the left side view is identical to the right side view.
The ornamental design for a pet cage, as shown and described.