Pollen and Mould allergy

[TJB]

If a horse has a mould and pollen allergy . Is it something that can worsen? Apparently it’s not in lungs. Can cough and have a runny nose. I understand re the use of haylage. Wondered if anyone else has any information advice regarding horse allergy. Thank you

 

[Flowerofthefen]

My horse has a pollen allergy. He is a headshaker. He coughs a bit this time of year and starts coughing a bit in the autumn. Nothing has helped my headshaker over the years. Has the vet said its an allergy?