The ornamental design for a petperch, as shown and described.
FIG. 1 is a front perspective view of a pet perch showing my new design in use.
FIG. 2 is a back perspective view of the pet perch in use.
FIG. 3 is a front perspective view of the pet perch.
FIG. 4 is a back perspective view of the pet perch.
FIG. 5 is a top view of the pet perch.
FIG. 6 is a bottom perspective view of the pet perch.
FIG. 7 is a bottom side perspective view of the pet perch shown with a cover partially removed; and,
FIG. 8 is a side perspective view of the pet perch shown with the cover partially removed.
The broken lines shown in the Figures are environment forming no part of the claimed design or show portions of the pet perch forming no part of the claimed design.