Supplemental salt can help your horse in hot weather

Horse drinking water
Horses need supplemental salt and fresh, clean water during hot weather.

Make sure the “dog days of summer” don’t bite your horse this year. Even at rest, your horse sweats more during hot weather, and he needs enough sodium (salt) to stay hydrated. One ounce per day (two tablespoons) is adequate for maintenance during cool months, but hot, humid weather calls for at least two ounces per day, and more if your horse is in work of any kind.

Provide a plain, white salt block in close proximity, and make sure your horse licks it; many horses do not—salt crystals may create tiny scratches on the tongue. Even better is to offer salt free choice by pouring granulated table salt in a bucket. You can also add salt to each meal. Use iodized salt only if your horse is not receiving iodine from another source. As for mineralized salt blocks, horses often avoid these because of their bitter taste.

If your horse works more than two hours at a time, then consider supplementing with electrolytes, which you can provide after exercise by adding it to a gallon of water. But remember: Electrolytes alone will not protect against dehydration, and electrolyte supplements should be given only to a horse that is already in good sodium balance. Electrolytes are designed to replace what is lost from perspiration and should contain at least 13 grams of chloride, 6 grams of sodium, and 5 grams of potassium.

And always, be sure to keep fresh, clean water nearby.

For more on this subject, sign up for Dr. Getty’s August 11 TeleSeminar, “Things You Need to Know About Salt, Water, and using Electrolyte Supplements”; get more details and register at The seminar will be recorded so registrants also have the option of listening at a later time.

Dr. Juliet Getty has taught and consulted on equine nutrition for more than 20 years. At horse owners and managers will find a library of helpful articles, a forum on nutrition, and a calendar of appearances, teleconferences and interviews; she is also available for individual consultations.


  1. Horses should be offered free choice salt blocks, trace mineral blocks and all purpose mineral blocks. Studies have shown that horses will take what they need. My horses go to each from time to time, why wouldn’t you offer all three?


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