Selenium is so sneaky. The only way to know
if your horse needs selenium is to do a selenium blood test. Maggie(my
horse) got pulled twice last year for muscle cramps. I never checked
her selenium cause the year before she was way over 200 and the vet told me to
cut back on the selenium. This year I checked it. 103!! Good
grief, no wonder the mare had muscle cramps in the hind end. So far she
has had 3 selenium vitamin E shots and the selenium supplement has been
increased. I am done with the shots, she has knots in her neck but boy
does she feel strong. So if it hasn't been done, check the horse's
level. Then you will know what you need to do.
Jeanie