Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine the gluten-free oat flour and cinnamon.
Add the natural peanut butter, unsweetened applesauce, and water to the dry ingredients. Mix well until a dough forms.
Roll out the dough on a surface dusted with additional oat flour to prevent sticking. Use cookie cutters to create desired shapes.
Place the cut-out shapes on the prepared baking sheet, leaving a little space between each.
Bake in the preheated oven for 12-15 minutes, or until the treats are golden and firm to the touch.
Once baked, remove the treats from the oven and allow them to cool completely on a wire rack.
Store the gluten-free homemade dog treats in an airtight container to keep them fresh and delicious for your furry friend.