Water and hydration
How much water do puppies need compared to adult dogs?
Last updated 23 September 2026 · How we write and check this
Short answer
Puppies typically need more water relative to their body weight than adult dogs, often 60 to 100 ml per kg compared with an adult's 50 to 60 ml per kg, because their bodies hold a higher percentage of water and their metabolism runs faster during rapid growth.
The biological reason for the difference
A puppy's body composition includes a higher percentage of water than an adult dog's, and the energy demands of rapid tissue growth increase overall metabolic activity, both of which push relative fluid needs above the adult baseline.
Comparing the numbers directly
A 10 kg puppy might need 600 to 1,000 ml a day, compared with 500 to 600 ml for a 10 kg adult dog of similar activity level, meaning the same body weight can require noticeably more water simply because of the growth stage.
When the gap closes
As a dog approaches adult size, typically 9 to 18 months depending on breed, their relative water needs gradually shift down toward the standard adult range, tracking the slowdown in growth rate rather than a sudden switch.
Key takeaways
- Puppies typically need 60 to 100 ml per kg, higher than the adult 50 to 60 ml per kg.
- Higher body water content and faster metabolism explain the difference.
- A 10 kg puppy can need meaningfully more water than a 10 kg adult dog.
- Relative water needs gradually shift toward the adult range as growth slows.