I claim the ornamental design for a pet collar, as shown and described.
FIG. 1 is a top perspective view of a pet collar, showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings show portions of the pet collar which form no part of the claimed design.
The pet collar is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.