Grind plain oatmeal in a blender or food processor until it becomes a fine, flour-like powder (if you’re not using colloidal oatmeal). This helps it dissolve more easily in water and ensures it spreads smoothly over your dog’s coat.

In a large bowl or bottle, combine the ground oatmeal and baking soda. Slowly add the warm water while stirring or shaking (if using a bottle) to prevent clumping.

Mix until fully dissolved and well combined. Let the mixture sit for a few minutes to thicken slightly.