How much water does a dog need?

Every day, dogs lose fluids through breathing, activity and normal body processes, so that water needs to be replaced regularly. Proper hydration helps support your dog’s health and overall well-being.

How much water does a dog need each day?

On average, a healthy adult dog needs around 40 to 70 ml of water per kilogram of body weight per day:

• 5 kg dog: about 200–350 ml
• 10 kg dog: about 400–700 ml
• 20 kg dog: about 800–1400 ml

If your dog eats dry food, they will usually need more water. With a wet-food diet, part of their fluid intake comes from meals.

What affects thirst?

The amount a dog drinks can change from day to day. For example, after a walk or during hot weather, the bowl may empty faster than usual — and that can be completely normal.

Thirst often increases with:

• hot weather
• active walks and playtime
• dry indoor air
• dry food
• pregnancy and nursing
• recovery after exercise

How to tell if your dog is drinking too little

Pay attention if your dog:

• has dry gums
• rarely goes to the water bowl
• urinates less than usual
• seems lethargic or sleepy
• refuses food
• struggles in hot weather

These signs can point to dehydration, so do not delay contacting a veterinarian.

If your dog drinks too much

Increased thirst is also worth paying attention to. Sometimes it is linked to hot weather or diet, but if your dog suddenly starts drinking noticeably more than usual without a clear reason, it can also be associated with various health issues. This is especially important if the increased thirst comes with frequent urination, weight loss, weakness, vomiting or a reduced appetite.

How to support healthy drinking habits

• fresh water should always be available
• wash the bowl regularly
• change the water daily, and more often in hot weather
• bring water and a portable bowl when traveling
• place several bowls around the home if you have a large space

There is no single number that fits every dog. Look at your dog’s weight, lifestyle and the weather. If your dog is active, eating well and feeling good, small variations are usually nothing to worry about. Sudden changes in thirst, however, should not be ignored.