Prepare the pan
Grease a 6-inch cake pan and preheat your oven to 350°F. This gives your dog cake an even, soft bake.

Mix dry ingredients
Whisk the oat flour and baking powder in a bowl. Keep it light so the cake stays fluffy.

Mix wet ingredients
Stir the melted coconut oil, eggs, and honey together until smooth.

Combine both bowls
Pour the wet mixture into the dry mixture. Mix until a thick batter forms.

Fold in the blueberries
Gently stir in the blueberries so they stay whole and spread out inside the cake.

Bake the dog cake
Pour the batter into the prepared pan and bake for 25–30 minutes. A toothpick should come out clean.

Cool completely
Let the cake cool to room temperature before slicing. Warm cake can crumble, and cooling keeps it safe for your pup.