Internal Health

Why Is My Dog Drinking So Much Water?

5 min read Vet-informed guidance

Dogs drink more in hot weather or after exercise — that’s normal. But a sustained, unexplained increase in thirst (and weeing) is one of the most important early warning signs in dog health, and it always deserves attention. Here’s what could be behind it.

What counts as 'too much'?

As a rough guide, dogs drink around 50ml of water per kilo of body weight a day. A clear, ongoing increase beyond your dog’s normal — especially with more frequent or larger wees — is worth noting. The medical term is polydipsia.

Possible causes

Increased thirst can signal several conditions, which is exactly why it shouldn’t be ignored.

Kidney disease
Diabetes
Hormonal conditions such as Cushing’s disease
Certain medications
Sometimes simply hot weather, diet or activity

What to do

Track it and get it checked.

Note roughly how much your dog is drinking over a few days
Watch for other signs — weight loss, appetite changes, lethargy
Don’t restrict water, which can be dangerous
Book a vet visit to find the cause

Signs to look for

Drinking moreWeeing moreWeight lossLethargy

When to see your vet. A lasting increase in thirst always warrants a vet visit. A simple blood and urine test can identify the cause early, when conditions like kidney disease and diabetes are most manageable.

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FAQs

Why Is My Dog Drinking So Much Water?, answered

No — never restrict water, as this can be dangerous. Instead, get the underlying cause investigated by your vet.

Roughly 50ml per kilo of body weight per day, but it varies with weather, diet and activity. A sustained change from your dog’s normal is the key thing.

It can be an early sign of conditions like kidney disease or diabetes, which are far easier to manage when caught early — so it’s always worth checking.