When your horse is acting ill one of the first things your vet will ask you is whether your horse is running a fever. The video below shows you how to take your horse’s temperature. It’s a good idea to have a baseline temperature of your horse when he’s healthy so you have something to compare it to. Your horse’s temperature should be between 100 and 100.5 degrees Fahrenheit, or 37.5 and 38.5 degrees centigrade. Any temperature above 101.5 F is a cause for concern.
I generally use a plastic oral thermometer. My vet told me that because some of the digital thermometers give a reading very quickly, it may be necessary to leave the thermometer inserted and run it a second time.