Water and hydration
Why is my dog drinking more water than usual?
Last updated 23 September 2026 · How we write and check this
Short answer
Drinking more than usual is most often tied to something in the environment or routine: a hotter day, more walking, a new bag of dry food, or a course of medication. It becomes more of a question mark when it lasts beyond two or three days without any of these obvious triggers, in which case a vet visit helps identify the cause.
Start with recent changes
Go through the last week mentally: new food, new treats, warmer weather, a longer walk than normal, or a new medication are all common triggers for a temporary rise in thirst. Steroid medications in particular are well known for noticeably increasing water intake while a dog is taking them.
How long is too long
A one-off increase after a hot walk or a salty snack usually settles back to normal within a day. An increase that persists for most of a week, especially if it seems to be climbing rather than leveling off, is a different pattern worth a vet's attention.
Ruling things in and out
A vet visit for ongoing increased thirst typically starts with a physical exam plus blood and urine tests, which can identify or rule out common causes fairly quickly. Bringing a note of how much your dog drinks in a typical day helps the vet compare it against expected ranges for their weight.
Key takeaways
- Weather, exercise, diet, and medication are common short-term causes of increased thirst.
- A one-off spike usually resolves within a day or so.
- An increase lasting most of a week is a different pattern worth checking.
- Blood and urine tests are the standard way vets investigate ongoing increased thirst.