Many cats become less able to digest lactose after weaning. Cow’s milk can cause diarrhea, vomiting, bloating, or abdominal discomfort, though cats do not all respond the same way. Adult cats do not need milk; water should be their everyday drink.
Many adult cats are less able to digest lactose after weaning
Many cats become less able to digest lactose as they mature. Kittens produce lactase, the enzyme that breaks down milk sugar, but this ability commonly declines after weaning. VCA Animal Hospitals says most kittens lose the ability to digest lactose by about 12 weeks of age; the timing and degree of tolerance vary.
That is why a cat may eagerly lap up milk and still develop digestive upset afterward. Cats may like milk, but enthusiasm is not proof that it agrees with their digestive system. Ordinary cow’s milk is unnecessary for adult cats and is generally not recommended as a treat. Cornell University’s Feline Health Center notes that many cats are lactose-intolerant and can develop gastrointestinal problems from milk.
Why milk can upset a cat’s stomach
Lactose is the natural sugar in mammalian milk. Lactase is the enzyme that breaks lactose down. The ASPCA explains that cats do not possess significant amounts of lactase.
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When a cat cannot digest the lactose in milk, digestive signs may follow. The response varies from cat to cat; a cat’s interest in milk does not show whether it can digest it.
What happens if a cat drinks milk?
After a cat drinks cow’s or goat’s milk, watch for digestive signs such as:
- loose stool or diarrhea;
- vomiting;
- bloating; and
- abdominal discomfort.
These signs can occur with lactose intolerance, but they do not prove that lactose caused them. VCA Animal Hospitals advises providing a veterinarian with a detailed food history, including what the cat ate and the timing and severity of symptoms.
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When should you call a veterinarian?
Contact a veterinarian if symptoms are concerning, persist, or recur. Do not assume that every episode of vomiting or diarrhea is “just the milk”; a veterinarian can assess the cat and its food and symptom history.
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Do cats need milk?
No. Milk is not a necessary treat for cats and is generally not recommended. Offer fresh water as the everyday drink rather than using cow’s milk as a substitute.
Can kittens drink milk?
Kittens can nurse from their mother. Cow’s milk is not the appropriate substitute for a kitten that cannot nurse.
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An unweaned kitten that needs bottle-feeding should receive an appropriate kitten milk replacer formulated for cats. The ASPCA identifies kitten milk replacer for bottle-feeding, and VCA Animal Hospitals recommends consulting a veterinarian about suitable milk replacement for very young kittens. Follow veterinary guidance for the kitten’s care.
As kittens mature and are weaned, their ability to digest lactose commonly declines. Do not use cow’s milk as a routine substitute for nursing or kitten milk replacer.
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| Situation | Guidance |
|---|---|
| Adult cat offered milk as a treat | Milk is unnecessary and generally not recommended; many cats can develop gastrointestinal problems from dairy. (Cornell University College of Veterinary Medicine) |
| Very young, unweaned kitten | Do not use cow’s milk as a feeding substitute. Use an appropriate kitten milk replacer and consult a veterinarian. (ASPCA; VCA Animal Hospitals) |
What can cats drink instead?
Offer fresh water as the everyday drink. If a cat has symptoms after drinking milk, keep track of what it ate and when signs began, and share that history with a veterinarian if you seek advice.
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What about cheese, cream, and other dairy products?
The same caution applies to dairy products generally: cats vary in how they respond, and dairy is not a necessary treat. Do not assume that a cat’s interest in a dairy food means it will digest it without problems.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Bottom line
Many cats become less able to digest lactose after weaning, so ordinary milk can cause digestive upset. A cat’s symptoms do not by themselves establish the cause, and milk is not a necessary treat for adult cats.
Offer adult cats water. For an unweaned kitten that cannot nurse, use an appropriate kitten milk replacer with veterinary guidance. Contact a veterinarian if digestive signs are concerning, persist, or recur.
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FAQ
Are all cats lactose intolerant?
No. Many cats become less able to digest lactose after weaning, but cats do not all respond the same way. Milk is still unnecessary for adult cats and is generally not recommended as a treat.
Can cats drink cow’s milk?
Milk is not a necessary treat for cats, and many cats can develop gastrointestinal problems from it. Offer fresh water as the everyday drink.
What should I feed an unweaned kitten instead of cow’s milk?
Use an appropriate kitten milk replacer formulated for cats, and consult a veterinarian about a suitable replacement and the kitten’s care.
What should I do if my cat gets sick after drinking milk?
Note what the cat ate and the timing and severity of symptoms. Contact a veterinarian if signs are concerning, persist, or recur; symptoms alone do not prove that lactose was the cause.
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