Preheat your oven to 300F (150C). Line a baking sheet with parchment paper.
Add the oats to a food processor and grind until they reach a fine powder.
Add in the pumpkin and peanut butter and blend until a sticky dough is formed.
Remove from the processor and roll out on a lightly floured surface. (Use whole wheat flour, more ground oats, or another flour that you have on hand). Cut out cookies using a small cookie cutter of any shape, or alternatively just cut into squares with a knife.
Lay the treats on the prepared baking sheet and bake for 25 to 30 minutes, until the treats are dry and hard. Let cool before giving to your pup and then store in an airtight container. They should keep at least a week at room temperature, two weeks in the fridge, or you can freeze them.