The ornamental design for a petwastebagdispenser, as shown and described.
FIG. 1 is a front-top-right perspective view of a pet waste bag dispenser showing my new design;
FIG. 2 is a front-bottom-left perspective view thereof;
FIG. 3 is a rear-top-left perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a reduced left-side elevational view thereof, the right-side elevational view being a reduced mirror image thereof; and,
FIG. 9 is a reduced perspective view thereof shown attached to a lanyard via a swivel clip.
The broken lines shown in the figures represent portions of the pet waste bag dispenser that form no part of the claimed design. The broken line showing of the lanyard and the swivel clip in FIG. 9 represents environment and forms no part of the claimed design.