Preheat your oven to 350°F. Line two rimmed baking sheets with parchment paper or a silicone baking mat.

To the bowl of a stand mixer fitted with a paddle attachment add peanut butter and pumpkin, mix on medium for 1 minute. Add eggs, mix until well combined, scraping the sides of the bowls as needed. To a separate medium mixing bowl add flour, salt and cinnamon, whisk to combine. Add the dry ingredients into the wet ingredients and mix until combined. The mixture will be very dry. Add water one tablespoon at a time until a workable dough is achieved. Cover and move bowl to refrigerator for 30 minutes.

Lightly flour a clean working surface. Turn out the dough and form into a disc. Using a rolling pin, roll dough into a disc 1/4-inch thick.

Using a bone-shaped cookie cutter, cut out shapes and transfer the cut outs to the lined baking sheet. Re-roll dough scraps and cut out additional shapes.

Transfer baking sheets to preheated oven and bake for 40 minutes. If necessary, bake for additional time until cookies are hard and crunchy like graham crackers.