Are you sure it is the heaves and not asthmsa? My full size mare would go into an asthma attack once a year. The vet would come, give her an injection of steriods, then I would administer oral liquid steriods for about 5-6 weeks (they need to be weened off, not abruptly stopped). Her attacks would always take place in the humid /very pollen filled months (usually july/august) and would start with a heavy , hollow, deep chest cough that sounded like she had a dry hairball in her throat. She would then start wheezing and coughing, and her energy would just be drained. An asthma attack will continue until the animal is treated, much like a child, they can not work them selves out of an asthma attack without an inhaler (steriods for the horse). Very rarely a cold crisp environment will help them work their way out of an attack, but usually they need medical help, although a cooler, low humidity / pollen area would be good in the long run.
I had tried the herbal remedies, they don't do alot.
Promise
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