Also have the vet check her teeth. Very often older horses have teeth issues and incorrectly chewed food can cause coughing.
If she does have heaves or allergies the product that works best for my horse is Anihist http://www.valleyvet.com/ct_detail.html?pgguid=19991131-57b4-48e6-a291-feba6fe9c808 I put it in my mares pellets that I've wet down and it definitely helps. I have tried all other prescription meds that didn't help as well as the Anihist powder. You can not use it within 72 hours of horse shows that they drug test at though because it will come up as a positive.
Aprille
If she does have heaves or allergies the product that works best for my horse is Anihist http://www.valleyvet.com/ct_detail.html?pgguid=19991131-57b4-48e6-a291-feba6fe9c808 I put it in my mares pellets that I've wet down and it definitely helps. I have tried all other prescription meds that didn't help as well as the Anihist powder. You can not use it within 72 hours of horse shows that they drug test at though because it will come up as a positive.
Aprille