What happens next?

How to know if your horse is sick 
Check your horse's basic diagnostics. 
This means your horse's pulse/heart rate, respiratory rate, and temperature. 
Pulse-the normal heart rate for a horse is 25-42 beats per minute.

Select from the following.
[+] To check the horse's heart rate, place your palm on the horse's chest just behind the left elbow and feel for the bump-bump-bump of the heart beat. Count how many beats there are in a minute; this is the heart rate.
[+] Equine, western, and british arabian horses should have pulses that range from 80-100 beats per minute. A western arabian horse might have pulses higher than 120 beats per minute.
[+] The horse should have a constant rhythm-rapid or slow-at first, then progressively warmer. You may notice rapid or uncontrollable changes-your horse may suddenly bring their heads up-this is normal.
[+] The heart rhythm is 15-30 beats per minute. Body temperature-your horse takes on a normal temperature of 35-45 beats per minute (unless it is keeping track of how cold or hot you are or has been).
To check the horse's heart rate, place your palm on the horse's chest just behind the left elbow and feel for the bump-bump-bump of the heart beat. Count how many beats there are in a minute; this is the heart rate.