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How to make a salt lick for horses
Use salt that is meant for animal consumption.
Look for salt made for horses at your local pet store or feed store and buy it in bulk. Check that the salt is not a mineral salt blend, such as red salt, or salt that is meant for de-icing roads.
If you are introducing your horse to a salt lick, start with plain white salt or iodized table salt. The type of salt that is best for your horse will depend on his nutritional needs and his current diet.