Horse sweating too much: causes and what you can do

When is sweating normal or not?

Horses sweat during exercise, heat and stress. That is healthy. It becomes concerning when your horse is soaking wet after just a quiet 20-minute walk, stands sweating in the stable for no apparent reason, or barely gets damp after intense training (anhidrosis). As a rule of thumb: a horse that needs more than 30 to 40 minutes to dry off after normal work, or shows white foam patches on the neck and flanks without heavy exertion, deserves extra attention. Log patterns in the EquiSight horse profile so that you have a clear overview for your vet of how often and under what circumstances the excessive sweating occurs.

Common causes at a glance

• Poor fitness: an unfit or overweight horse has to work harder and sweats more quickly.
• Fever or infection: even a slight temperature rise of 0.5 °C above 38.5 °C can cause extra sweating.
• Pain or colic: sweating at rest combined with restlessness is a red flag.
• Hormonal disorders: Cushing's disease (PPID) in horses older than 15 years is often accompanied by abnormal sweating.
• Stress and anxiety: a nervous horse activates the sympathetic nervous system and produces more sweat.
• Poor ventilation: a stable without sufficient air circulation raises the ambient temperature and worsens the problem.

Electrolytes and fluids: the basics

Horse sweat contains far more sodium, potassium and chloride than human sweat. During an hour of intense work, a horse can lose 10 to 15 litres of fluid. Replenish this with fresh, clean drinking water — a minimum of 30 litres per day at rest, up to 60 litres in heat or during training. Electrolytes can be added to feed or water, but only do this if the horse is drinking sufficiently; giving electrolytes to a dehydrated horse without free access to water is counterproductive. Check hydration using the skin pinch test: pinch the skin on the neck and release — in a well-hydrated horse the skin springs back within one second.

When should you call the vet?

Call immediately if the sweating is accompanied by one or more of the following signs:

• Sweating at rest for no identifiable reason, lasting longer than 30 minutes.
• Fever above 38.5 °C combined with reduced appetite.
• Signs of colic: looking at the abdomen, rolling, refusing to eat.
• Tremors (muscle twitching) or muscle stiffness after exercise — possibly tying-up.
• Sweating that stops during intense work (anhidrosis), visible as a dry, hot horse after a canter.

Practical management adjustments

• Build fitness gradually: do not increase training intensity by more than 10% per week.
• Clip a thick-coated horse in good time: a long coat raises body temperature quickly.
• Ensure a minimum of 50 m³ of air exchange per hour in the stable.
• Schedule heavy work early in the morning or late in the evening when temperatures exceed 20 °C.
• Use an anti-colic supplement or administer sodium bicarbonate via your vet for horses prone to tying-up.

EquiSight helps you recognise patterns

Sporadic sweating is difficult to assess without data. With the EquiSight horse profile you can record after each training session how hard the work was, the ambient temperature and how long the horse needed to dry off. After a few weeks you can immediately see whether there is a pattern in the circumstances. EquiCoach analyses this data and provides concrete suggestions, such as 'over the past 14 days your horse sweated significantly more at temperatures above 22 °C — consider shifting training to the morning'. This way you not only maintain your horse's health, but also optimise your training schedule through the EquiSight calendar.