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Can cats eat cow's milk?

Avoid

Most adult cats can't digest lactose and get diarrhea — use lactose-free cat milk instead.

Skip it; offer a little lactose-free cat milk instead.

Why

After weaning, lactase declines, so most adult cats get diarrhea or bloating from milk. The milk-drinking cat is a storybook image. If your cat loves it, use lactose-free cat milk as a treat.

If your cat has a condition

  • Kidney disease Avoid Lower than the 2,000 mg/1000kcal kidney-diet line. Phosphorus 1,552 mg/1000kcal
  • Diabetes Avoid Some carbohydrate — keep it occasional. Carbs 29% of calories
  • Heart disease (HCM) Avoid Low in salt. Sodium 597 mg/1000kcal
  • Urinary stones Avoid Contains calcium — another reason to avoid with a history of calcium oxalate stones.

Nutrition per 100 g

Nutrients per 100 g, with phosphorus also shown per 1000 kcal
Calories67 kcal
Protein3.09 g
Fat3.85 g
Carbohydrate4.86 g
Phosphorus104 mg 1,552 mg/1000kcal
Sodium40 mg
Potassium162 mg

Source: Korea MFDS Food Nutrient Database — 우유

FAQ

Can kittens drink cow's milk?

No. It differs from queen's milk and causes diarrhea; use kitten milk replacer.

SourcesReviewed 2026-10-24

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