HORSE HEART RATE. An adult horse at rest will have a pulse rate ranging from 30 to 40 beats per minute. Foals will have a pulse rate ranging from 70 to 120, yearlings from 45 to 60 and two-year-olds from 40 to 50.If you are using a stethoscope, place it on the horse s girth area just behind the left elbow.he sounds you hear (if you have your speakers on) is the heart of a horse recovering after ten minutes of loping. His heart rate was about 150 beats per minute and down to approximatly 60 beats per minute at the end of the recording.