The ornamental design for a dogcage, as shown and described.
FIG. 1 is a front elevational view of a dog cage showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The broken lines in the drawings depict portions of the dog cage that form no part of the claimed design.
The dash-dot-dash-dot broken lines are boundary lines and define the bounds of the claimed design. The claimed design extends to the boundary lines but does not include the boundary lines.