I often get asked about grains in a cat’s diet. Barley is generally safe for cats when offered properly, but there are important guidelines to follow.

As a veterinarian, I recommend barley as an occasional treat, not a dietary staple. Its fiber can aid digestion, but too much may cause issues. Let’s explore the details.

Is Barley Safe or Toxic for Cats?

Barley is not toxic to cats. It is a whole grain that many commercial cat foods include as a source of carbohydrates and fiber. However, cats are obligate carnivores, so their primary nutrition should come from animal protein. Plain, cooked barley is safe, but raw barley is hard to digest and may cause gastrointestinal upset.

Health Benefits and Risks

Barley provides soluble fiber, which can support healthy digestion and help with hairball control in small amounts. It also contains vitamins and minerals like selenium and magnesium. The main risk is overfeeding: too much barley can lead to obesity, digestive upset, or nutritional imbalances because it fills your cat up without providing essential animal-based nutrients.

Safe Serving Size and Preparation

Serve only plain, cooked barley without any salt, butter, oil, or seasonings. For an average cat (10 lbs), a teaspoon to one tablespoon of cooked barley once or twice a week is plenty. Mix it into their regular food or offer as a separate treat. Never replace a meal with barley.

Symptoms of Trouble

If your cat eats too much barley, watch for vomiting, diarrhea, bloating, gas, or loss of appetite. These signs usually resolve within 24 hours if barley is the cause. Persistent symptoms may indicate an underlying issue.

What to Do If Your Cat Ate Too Much Barley

Remove any remaining barley and offer fresh water. Monitor your cat closely for signs of distress. If vomiting or diarrhea continues beyond 24 hours, or if your cat seems lethargic or in pain, contact your veterinarian. For severe reactions, call the ASPCA Animal Poison Control at (888) 426-4435.

Safety note: Always introduce new foods slowly and in small amounts to monitor for adverse reactions.