My horse is 6 months pregnant and she is bleeding need to know what to do?
Call a large animal vet immediately.
This could be a sign of almost anything - gestational pyometritis, a miscarriage, trauma. Any of these conditions could be fatal. You need to call the vet immediately. It doesn't matter if it's his off day. Ring NOW.
Bleeding could be as simple as a varicosed vein that has ruptured in the vagina due to pressure...but, of course a call to the vet is very well worth it to insure the best possible outcome for your mare.