The ornamental design for a petreliefstation, as shown and described.
FIG. 1 is a perspective view of the pet relief station showing the design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG, 6 is a top plan view thereof.
FIG. 7 is bottom plan view thereof.
FIG. 8 is a left side devotional view of an alternative embodiment of the design; and,
FIG. 9 is a right side elevational view of an alternative embodiment of the design.
The broken lines shown on the pet relief station are interior spaces viewable through cutouts and form no part of the claimed design. The remaining broken lines shown in the figures represent portions of the pet relief station that form no part of the claimed design.