Mix oat flour, pumpkin purée, peanut butter, egg, and water until smooth.

Pour batter into a greased small cake pan or silicone mold.

Bake for 25–30 minutes or until a toothpick comes out clean.

Let the cake cool completely before frosting.

Mix Greek yogurt with a small amount of peanut butter for dog-safe frosting.

Frost the cooled cake and decorate with dog treats or berries.

Serve small portions to your dog.