In an electric mixer, beat together pumpkin puree, nut butter, and eggs until well combined.
Add in flour gradually, approximately a half cup at a time. Mix until incorporated.
Add in spinach and carrots. Mix until incorporated.
Knead dough into a ball. Either roll the dough out and use cookie cutters to create shapes, or use your hands to shape into small heart or flat, circular dog biscuits. (If rolling dough out to use cookie cutters, chill the dough in the refrigerator for 1 hour to make the dough stiffer/easier to roll out & cut. Dip cookie cutter in almond flour to prevent sticking. You can also use a knife to cut rolled dough into squares).
Place treats on a baking sheet lined with parchment paper and bake for 25 minutes or until treats turn golden brown on the edges.