Why a 25 kg dog handles raw oats differently
Your dog’s larger stomach capacity means the handful of oats will disperse more widely, reducing the chance of a dense blockage. However, the unprocessed grain still requires extra work from his digestive enzymes. Expect him to drink more water than usual as the dry oats absorb fluids internally—this is normal but may lead to frequent bathroom breaks.
The expansion effect in bigger breeds
Raw oats can swell to three times their dry volume when hydrated in the stomach. For a dog your pet’s size, this creates noticeable but manageable fullness. You might observe him lying on cool surfaces to relieve abdominal pressure or passing particularly bulky stools later. These are expected reactions unless accompanied by whining or loss of appetite.
When cooking changes everything
Heat treatment pre-gelatinizes the oats, making them instantly recognizable to your dog’s metabolism. If you ever prepare oats for him, the cooked version skips the uncomfortable expansion phase entirely. A quarter cup of plain cooled oatmeal would be an appropriate serving for his weight, providing soluble fiber without the digestive friction of raw grains.
The full verdict, portion guidance and serving notes are collected on the Oats & oatmeal food facts page.