A number of factors can contribute to a loss of appetite. We assume you have checked the horse's vital signs to make sure that he is not sick or possibly getting sick. We also assume that there have been no sudden changes in the hay type or source as well as grain. Another cause of reduced appetite could be dental problems. If your horse's teeth have not been checked within the last six months, you should have them checked. Thiamine deficiencies can also affect appetite. However, if you are feeding a good-quality hay, that should not be a problem but is still something to consider. Finally, reduced water intake will also cause a reduction in appetite. With cold weather and low water temperatures, horses often reduce water intake, which can affect feed intake. You may want to monitor water intake to make sure your horse is drinking at least eight to 10 gallons per day. You may also want to consider looking at the water temperature and possibly warming it to 40° to 50°F, as research has shown that at cool temperatures horses drank 34 to 41% less water. Also, to help stimulate water intake, if it is low, make sure salt is provided free choice. You may even consider adding a small amount of salt to the horse's feed to help stimulate water intake.

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