Water and hydration
How much extra water does a dog on dry food need?
Last updated 23 September 2026 · How we write and check this
Short answer
A dog eating only dry kibble typically needs close to the full 50 to 60 ml per kg from the water bowl alone, since kibble supplies very little moisture itself. In practice this can mean 150 to 250 ml (5 to 8.5 fl oz) more bowl water per day compared with a dog on a mostly wet diet of the same body weight.
Why dry food shifts the burden to the bowl
Kibble at roughly 8 to 10 percent moisture provides only a small fraction of a dog's daily fluid needs from food itself, unlike wet food that can supply well over half. This means a dry-fed dog relies on the water bowl for nearly all of the standard 50 to 60 ml per kg target.
A worked example
A 20 kg dog eating 400 g of kibble a day gets roughly 35 to 40 ml of water from the food itself, leaving 960 to 1,160 ml (32 to 39 fl oz) still needed from the bowl to reach the full daily range, compared with a dog on wet food needing far less from drinking alone.
Practical steps for dry-fed dogs
Keep at least two water points in the house for a dry-fed dog if you have more than one floor, since they need to drink more often to hit their target. Some owners also add a splash of water to kibble to soften it and add a little moisture, which most dogs accept readily.
Key takeaways
- Kibble supplies only around 8 to 10 percent of its weight as water.
- A dry-fed dog needs close to the full 50 to 60 ml per kg from the bowl.
- A 20 kg dry-fed dog needs roughly a liter of bowl water a day.
- Multiple water points and moistened kibble both help dry-fed dogs meet their needs.