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How to make an oatmeal bath for a dog
Grind a cup of plain oatmeal into a fine powder.
Grab some plain, raw oatmeal without sugar, fruit, or other flavoring additives. Use a food processor or coffee grinder to blend a cup (240 ml) of it until you've created a fine powder.
The powder will dissolve in water better. Place a non-slip mat in your tub.