How Much Water Should a Dog Drink a Day? (Chart by Weight)

By The Tail Project Team · Updated 26 October 2026 · 6 min read

Water is the simplest part of your dog's care, and one of the easiest to get wrong, especially in Indian summers, on long walks and on road trips.

Here's how much water your dog actually needs, how to tell if they're getting enough, and when a change in drinking habits is worth a vet visit.

How much water should a dog drink a day?

A common rule of thumb is about 1 ounce of water per pound of body weight per day. In metric, Whole Dog Journal reports that internal-medicine specialists put normal intake at 50–80 ml per kg per day for dogs resting in a comfortable temperature.

Dog's weight	Approx. water per day	Example breeds
5 kg	250–400 ml	Shih Tzu, Pomeranian, toy breeds
10 kg	500–800 ml	Beagle, smaller Indie dogs
20 kg	1–1.6 litres	Indie (Indian Pariah), Border Collie
30 kg	1.5–2.4 litres	Labrador, Golden Retriever, German Shepherd
40 kg	2–3.2 litres	Large German Shepherd, large Labrador

These are general estimates for healthy adult dogs at rest. Individual dogs vary, and breed weights vary widely.

What makes a dog need more water?

• Hot weather. Dogs cool down mainly by panting, which loses water. In Indian summers, expect your dog to drink noticeably more.
• Exercise and long walks. Active dogs need water before, during and after activity.
• Dry food. Dogs on kibble get less water from food than dogs on wet or home-cooked food, so they drink more.
• Puppies. Young puppies can't concentrate their urine as well as adults and tend to drink more.
• Illness. Vomiting, diarrhoea or fever can quickly increase water loss.

Signs your dog may be dehydrated

According to a vet-reviewed guide from GoodRx, signs of dehydration in dogs include:

• Low energy or lethargy
• Panting when not exercising
• Dry nose and dry, sticky gums
• Sunken, dry-looking eyes
• Thick saliva
• Loss of appetite

Two quick checks at home:

1. Skin test: gently lift the skin between your dog's shoulder blades. Well-hydrated skin snaps back quickly. Skin that stays up or returns slowly can be a sign of dehydration.
2. Gum test: press a finger on your dog's gum until it turns pale, then let go. Colour should return within about 2 seconds.

If your dog shows signs of dehydration, especially after heat exposure or with vomiting or diarrhoea, contact your vet promptly.

Is my dog drinking too much water?

Some days your dog will drink more, for example after a long walk on a hot day. That's normal.

What's worth watching is a persistent change. Whole Dog Journal advises seeing a vet if your dog consistently drinks more than the normal range for their weight, and GoodRx recommends a vet visit if your dog drinks much more than usual for several days. Excessive thirst usually comes with more urination, and it can be linked to conditions such as kidney disease, diabetes or Cushing's syndrome. These need a vet's diagnosis, so don't try to guess at home.

Tip: if you're worried, measure it. Fill the bowl with a known amount of water in the morning, top up with measured amounts, and note how much is gone after 24 hours. Your vet will find this very useful.

How to help your dog drink enough

At home

• Keep fresh water available all day and change it at least once or twice daily.
• Wash the bowl every day. Slimy, smelly bowls put dogs off drinking. Stainless steel bowls are easy to clean and don't hold smells like some plastics.
• Use more than one water point in bigger homes, so water is never far away.
• Keep bowls in the shade in summer, away from direct sun.
• For busy days, a 2-in-1 food & water dispenser keeps water topped up alongside the food bowl.

On walks, trips and car rides

• Carry water on longer walks, and always in hot weather.
• Offer water regularly during breaks, especially on hot days.
• Use a portable pet bottle so you don't need to carry a separate bowl. Our Pet Water Bottle with Cup is leak-proof, works with one hand and has an attached drinking cup.
• Walk in cooler hours (early morning or late evening) in summer. Our paw-care guide explains why hot pavement is a problem too.
• Planning a road trip? Read our checklist for travelling with your dog by car.

Frequently asked questions

How much water should a 10 kg dog drink per day?

Roughly 500–800 ml per day for a healthy adult dog at rest, and more in hot weather or after exercise.

Should I leave water out for my dog all day?

Yes, healthy dogs should have access to fresh, clean water at all times, unless your vet has advised otherwise for a specific medical reason.

Why is my dog suddenly drinking a lot of water?

Heat, exercise or a change to drier food can increase thirst. But if your dog keeps drinking much more than usual for several days, especially with more urination, see a vet, because it can be a sign of an underlying health problem.

How can I tell if my dog is dehydrated?

Look for lethargy, dry or sticky gums, sunken eyes, thick saliva and loss of appetite. Check whether the skin between the shoulder blades snaps back quickly, and whether gum colour returns within about 2 seconds after pressing. Contact your vet if you're concerned.

How do I keep my dog hydrated on a walk?

Carry a portable pet water bottle, offer water at every break, walk in the cooler parts of the day and take breaks in the shade.

The bottom line

Most dogs need about 50–80 ml of water per kg each day, more when it's hot or they're active. Keep clean water available, carry water when you're out, and watch for big changes. When in doubt, ask your vet. 💧🐾

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