Tail Raised or Held Off to One Side
Assess the horse's general health using the Whole Horse Exam (WHE), looking for other signs of abdominal pain and noting heart rate, rectal temperature and gum color. Mares in abdominal pain will usually not have an appetite and will be uninterested in their surroundings. Take note of the amount and appearance of the urine and share your findings and concerns with your vet. It might be helpful if you catch a sample.
Your vet will assess your horse's general health to determine the reason for the behavior. Rectal palpation and ultrasound can allow the vet to look at the reproductive tract and bladder and provide important information.
Does the mare's attitude and appetite seem normal?
Is the mare acting like she is in heat?