[header] How to take a horse's vital signs [title] Use a thermometer. [step] Lubricate the tip with petroleum jelly or vaseline. [title] Move the horse's tail to the side, so that it is out the way. 
[step] Insert the thermometer into the horse's rectum, angled slightly towards the ground. [title] Leave the thermometer in position for at least three minutes or until it beeps.