How much water does a horse drink per day?

The basic guideline: 25 to 55 litres per day

For an average warmblood of 500 to 600 kg, a daily water intake of approximately 25 to 55 litres at rest applies. Ponies and smaller horses generally drink less: a pony of 250 kg typically needs no more than 15 to 25 litres per day. These amounts apply in normal weather, with light work and a mixed ration of roughage and concentrates. As soon as any of these factors changes, the water requirement changes with it. Use the horse profile in EquiSight to keep track of your horse's weight and activity status, so you always have a realistic reference point.

Factors that increase water requirements

Various circumstances mean that your horse needs considerably more water than the basic guideline:

• Heat and humidity: at temperatures above 25 °C, requirements can double to 60–80 litres per day.
• Heavy work or competitions: a horse that sweats heavily loses not only water but also electrolytes and needs replenishment more quickly.
• Dry roughage: hay contains only 10–15% moisture, while fresh grass contains up to 80% moisture. A hay-based ration therefore requires a higher free water intake.
• Lactation: a nursing mare needs up to 20 litres extra per day for milk production.
• Illness or fever: at an elevated body temperature, fluid loss increases.

How to recognise dehydration in time

Dehydration in horses develops quickly and can lead to intestinal blockage (impaction colic). The skin pinch test is a quick check: gently pinch the skin on the neck and release. If the skin springs back within one second, hydration is good. If it takes two seconds or longer, fluid replenishment is necessary. Other signs include: dry mucous membranes (check the gum line), slow capillary refill time (more than two seconds after pressing on the gums), dark and strong-smelling urine, and reduced manure output. If in doubt, contact a vet immediately.

Water trough or bucket: which works better?

Both options work well, but there are practical differences. An automatic water trough has the advantage that water is always fresh and available. The downside: you cannot see how much your horse is drinking. A 15 to 20 litre bucket makes intake easy to measure, but requires more frequent refilling. Always check that the trough is clean — horses sometimes refuse contaminated or heavily chlorinated water. In winter, place a submersible heater in the trough to prevent freezing; horses drink considerably less very cold water (below 5 °C), which increases the risk of colic.

Electrolytes: when are they needed?

During intensive work or prolonged sweating, a horse loses not only water but also sodium, potassium and chloride. Ordinary water intake is then insufficient. Electrolytes can be administered via drinking water, over feed, or as a paste. Note: never give electrolytes without ensuring sufficient drinking water is available — they stimulate thirst, but if the horse does not drink enough, the situation worsens. A salt lick in the stable offers a low-threshold way to replenish deficiencies. Register supplements and training intensity in the EquiSight horse profile to maintain a complete overview.

Daily checks: make it a habit

• Check every morning that the trough or bucket is clean and filled.
• Watch for changes in drinking behaviour: drinking less can be an early sign of pain or illness.
• In hot weather or after heavy training, note the estimated intake in the EquiSight diary.
• In summer, provide multiple drinking points in the pasture, especially for groups of horses.
• Check the colour of the urine: light yellow is good, dark yellow or brown indicates insufficient fluid intake.