How Much Water Does a Rabbit Need?

Our feed guide covers pellets and hay, but water is a separate, genuinely sizeable daily requirement of its own — and, unusually for this site, the best figure we found comes from a veterinary reference rather than a university extension source.

About 120ml per kg of bodyweight a day

The MSD Veterinary Manual (published by Merck & Co., a peer-reviewed professional veterinary reference) gives a maintenance water intake of approximately 120ml per kg of bodyweight per day for rabbits. For a 2kg rabbit, that works out to roughly 240ml — about a cup — a day. The manual notes this is roughly double the water intake of a similarly sized dog or cat, a useful comparison if you're used to other pets.

Sick or dehydrated rabbits need much more

The same source gives a specific clinical figure for context: a dehydrated rabbit under veterinary care should receive double the maintenance rate — around 240ml/kg/day — for at least 24 hours. That's not a home-care target, but it underlines how much a rabbit's fluid needs can climb when something is wrong, and it's a reason to take reduced drinking seriously enough to call a vet rather than wait it out.

Bowls beat bottles for actual intake

The MSD Veterinary Manual notes that rabbits drink noticeably more from open bowls than from sipper bottles. That's worth knowing if you've defaulted to a bottle for tidiness — it may be quietly under-supplying a rabbit that would drink more from a bowl, without any obvious sign that anything is wrong.

What we couldn't confirm

Our source doesn't specifically address how a high-fresh-vegetable diet changes water intake for rabbits, or give a lactation-specific multiplier the way some other species' guides on this site do. It's reasonable to expect a rabbit eating plenty of fresh, high-moisture greens to drink somewhat less, and a nursing doe to need more — but we're not stating either as a sourced figure.

What this means for your setup

• Offer water in a bowl where practical, not just a bottle, and check that a bottle-only setup isn't under-supplying a rabbit that would drink more given the choice.
• Watch for reduced drinking as a genuine warning sign, not just a preference — a rabbit drinking noticeably less than usual is worth a vet check, not a wait-and-see.
• Budget pellets and hay alongside water with the feed cost calculator.

Source: MSD Veterinary Manual, “Nutrition of Rabbits”: msdvetmanual.com. Sources checked: September 2026. General information, not a substitute for advice from a vet.

Common questions

How much water does a rabbit drink a day?

The MSD Veterinary Manual gives approximately 120ml per kg of bodyweight per day as a maintenance figure — for a 2kg rabbit, that's roughly 240ml (about a cup) a day. The manual notes this is roughly double the water intake of a similarly-sized dog or cat.

Does a rabbit drink less if it eats a lot of fresh vegetables?

It's a reasonable expectation, since fresh, high-moisture food generally reduces drinking in other species, but our source for the 120ml/kg figure doesn't specifically address diet composition for rabbits, so we're not stating it as a confirmed effect.

Should I use a water bottle or a bowl for a rabbit?

A bowl, if you can keep it from being tipped over or contaminated with bedding. The MSD Veterinary Manual notes rabbits drink noticeably more from open bowls than from sipper bottles, which suggests bottles may under-supply naturally thirsty rabbits without an owner noticing.

The water calculator turns these figures into a daily and weekly total for your rabbits.