Water and hydration
How much water should I bring on a hike with my dog?
Last updated 23 September 2026 · How we write and check this
Short answer
As a general rule, bring at least 500 ml (17 fl oz) per 10 kg (22 lb) of body weight for a half day hike, doubling that for a full day or hot conditions. A 20 kg dog on a four hour hike would need roughly 1 to 1.5 liters (34 to 51 fl oz), more if the terrain is demanding or the weather is warm.
Scaling water for hike length
For a shorter hike of one to two hours, roughly 300 to 500 ml per 10 kg is usually enough, while a full day hike of six hours or more can require 1 to 1.5 liters per 10 kg, especially with significant elevation gain that raises exertion and panting.
Terrain and weather adjustments
Steep, exposed trails with little shade increase water needs well beyond flat, shaded paths at the same distance. Always plan for the hottest, most exposed section of the route rather than the average conditions across the whole hike.
Do not rely on natural water sources
Streams, ponds, and puddles along a trail can carry parasites or bacteria, so they should not replace carried water as your dog's main source, even though a quick drink from a clean-looking stream is unlikely to cause serious harm on its own.
Key takeaways
- Roughly 500 ml per 10 kg is a reasonable half day hiking guide, doubling for a full day.
- Elevation gain and exposed, shadeless terrain both raise real water needs.
- Plan water amounts around the hottest, most exposed part of the route.
- Carried water should be the main source rather than relying on streams or puddles.