Water and hydration
How much water per kg should a dog drink?
Last updated 23 September 2026 · How we write and check this
Short answer
The commonly used figure is 50 to 60 ml of water per kilogram of body weight per day for a healthy adult dog at rest in moderate weather. To use it, multiply your dog's weight in kilograms by 50 for the lower estimate and by 60 for the higher one. Heat, exercise, and diet moisture shift the real number above or below that range.
Where the 50 to 60 ml figure comes from
This range reflects typical maintenance fluid needs for adult dogs measured under normal indoor conditions, and it is the figure most vets and pet nutrition references use as a baseline. It accounts for water lost through breathing, panting, urination, and normal bodily processes each day.
Using the figure with real weights
A 6 kg dog needs about 300 to 360 ml (10 to 12 fl oz); a 15 kg dog needs about 750 to 900 ml (25 to 30 fl oz); a 40 kg dog needs about 2 to 2.4 liters (68 to 81 fl oz). These are starting estimates rather than exact targets.
When per kg math breaks down
The per kg figure assumes moderate temperatures and low activity, so it consistently underestimates needs for working dogs, dogs in hot climates, and nursing mothers. Rather than recalculating constantly, use it once as a baseline and then adjust upward when the weather, exercise, or diet clearly changes.
Key takeaways
- 50 to 60 ml per kg of body weight per day is the standard baseline for adult dogs.
- Multiply body weight in kilograms by 50 and by 60 to get a personal range.
- The figure assumes moderate temperatures and average activity.
- Heat, exercise, and nursing all push real intake above the baseline.