Preheat oven to 350°F and line a baking sheet with parchment paper or silicone mat.
In a large bowl, stir together the flour, oats, and salt.
Add the eggs, pumpkin puree, and peanut butter. Mix until the dough is crumbly.
Add water, a little at a time, until the dough holds together.
Roll the dough on a floured work surface to 1/2 inch thick.
Cut into shapes with a cookie cutter or pizza cutter. Re-roll scraps for more treats.
Place treats on the baking sheet and bake for 30–40 minutes, or until golden brown and hard.
Let cool completely before serving or storing in an air-tight container.