Pocket VetCan cats drink milk?
⚠️ Caution — conditions applyDespite the classic image, most adult cats lack enough lactase to digest cow's milk. A saucer of milk often leads to diarrhea. It also adds empty calories. Water is the best drink for cats.
Did your cat already eat milk?
Describe what and how much (add a photo) for an instant, calm triage — home care, vet soon, or emergency.
Check my cat nowSigns to look for
- ●Diarrhea, loose stool
- ●Gas and stomach upset
- ●Vomiting in sensitive cats
What to do
- ✓Offer fresh water instead of milk
- ✓If you want a treat, use cat-specific lactose-free milk sparingly
- ✓Stop if you notice any digestive upset
Frequently asked
Why can't cats drink milk?
Kittens digest their mother's milk, but most cats lose the lactase enzyme as adults. Without it, the lactose in cow's milk ferments in the gut and causes diarrhea.
Is any milk safe for cats?
Lactose-free 'cat milk' products are gentler as an occasional treat, but plain water is always the best choice for hydration.
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Check my pet — 5 freePocket Vet editorial team
Written and maintained by the Pocket Vet editorial team using authoritative veterinary sources. Reviewed June 9, 2026. This guide is informational only and not a substitute for professional veterinary care — see our editorial & safety policy. When in doubt, contact your vet; in a true emergency, go to an emergency clinic immediately.
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