Preheat oven to 350°. Line baking sheet with parchment paper.
Put the oats into a food processor and blend into a fine powder. Add the applesauce and coconut oil and blend again. Add the flour to form the dough ball.
Remove from the food processor and roll out on a lightly floured surface until the dough is about 1/4 inch thick or roll out on the parchment paper. I roll the dough on the parchment paper because it has ruler markings which make it easier to measure and cut.
I use a pizza cutter to make small squares because I have small dogs, but for bigger dogs you could use cookie cutters too.
Put the treats on the baking sheet and bake for 25 to 30 minutes, until lightly browned.
Let cool before giving to your pup. Store at room temperature for up to 1 week, in the fridge up to 2 weeks or even in the freezer. But honestly, my two pups go through a batch in a week.