Water and hydration
How much water should a senior dog drink?
Last updated 23 September 2026 · How we write and check this
Short answer
Senior dogs generally follow the same 50 to 60 ml per kg guide as adult dogs, but many drink somewhat more or less than they did earlier in life due to changes in kidney function, activity, and diet. A steady, gradual shift is common with age, while a sudden or sharp change in either direction is worth mentioning to a vet.
What usually changes with age
Kidney efficiency naturally declines to some degree in most dogs over roughly 8 to 10 years old, which can mean the kidneys need more water to flush waste, gradually nudging intake upward. At the same time, less active senior dogs eating smaller meals sometimes drink slightly less overall.
Reading the change correctly
A gradual increase of perhaps 10 to 20 percent over many months in an otherwise healthy senior dog is common and often not a concern by itself. A sudden jump, especially doubling within a week or two, is a different pattern and points to something worth investigating rather than normal aging.
Making water easy for an older body
Arthritic senior dogs sometimes drink less simply because bending down to a low bowl is uncomfortable. Raising the bowl to chest height and placing a second bowl on another floor of the house, if there are stairs, removes a physical barrier that has nothing to do with thirst itself.
Key takeaways
- Senior dogs follow roughly the same 50 to 60 ml per kg guide as adults.
- A gradual rise in thirst with age is common due to normal kidney changes.
- A sudden, sharp change is different from gradual aging and worth flagging.
- Raising the bowl height can help arthritic seniors drink comfortably.