Tape bully dog treat stick in an upright position in your popsicle molds.
Pour 1/4 cup (about an inch high) of the pureed blackberries into the bottom of each mold, allow it to freeze for an hour.
Pour 1/4 cup (about an inch high) of the pureed spinach into the mold, allow it to freeze for an hour.
Pour the final layer of pureed blackberries.
Freeze for 8 hours to allow them to fully set.
Run warm water around the mold to remove the pops.
Makes 6 popsicles.