Dehydration in cats

By
✔ MRCVS
BSc
BVM&S
FHEA
Updated October 16, 2025
4 min read

What to do

Causes

When to worry

Prevention

Diagnosis

Home treatment

Vet treatment

Risk

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Dehydration in cats

By
✔ MRCVS
BSc
BVM&S
FHEA
Updated October 16, 2025
4 min read

Dehydration happens when your cat doesn't drink enough fluid to make up for what their body is losing. Untreated dehydration is life-threatening. Cats of any breed or sex may become dehydrated, but kittens, older cats and cats with other illnesses are most at risk.

Cats become dehydrated when the amount of fluid they take into their body is less than the amount they lose in urine, faeces (poo), panting, and vomit (sickness). Mild dehydration is easily corrected when your cat drinks more. But dehydration can also be a symptom or cause of serious illness. If left untreated, severe dehydration leads to organ damage and eventually organ failure. Talk to a vet as soon as possible if your cat refuses to eat or drink and/or is unable to keep fluids down.

What to do if your cat is dehydrated >What to do if your cat is dehydrated [What to do

Common causes of dehydration in cats >Common causes of dehydration in cats [Causes

When to worry if your cat is dehydrated >When to worry if your cat is dehydrated [When to worry

Tips to prevent your cat becoming dehydrated >Tips to prevent your cat becoming dehydrated [Prevention

How to tell if your cat is dehydrated >How to tell if your cat is dehydrated [Diagnosis

Caring for dehydrated cats at home - and when not to! >Caring for dehydrated cats at home - and when not to! [Home treatment

Vet Treatment for dehydration in cats >Vet Treatment for dehydration in cats [Vet treatment

Are some cats at more risk of dehydration? >Are some cats at more risk of dehydration? [Risk

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