In a large mixing bowl, combine pumpkin, eggs, peanut butter, and cinnamon.
Add whole wheat flour. Stir just until combined.
On a floured surface (use whole wheat flour), roll out the dough into about 4 flat squares, wrapping each one in plastic wrap. Place them in the refrigerator for 1 hour, or up to two days.
Heat oven to 350℉. Line a large baking sheet with parchment paper.
Roll out the dough and use cookie cutters to make cookie shapes. Use tiny for little dogs or large cookie cutters for larger dogs. Dip the cutters into whole wheat flour if they are sticking to the dough.
Place cookies on a large baking sheet. Bake 20-40 minutes, depending on the size of the cookie, and if you want it soft or harder.
Remove from oven and move cookies to a cooling rack to cool completely. Store in an airtight container at room temperature for up to two weeks or store in the freezer up to 6 months.