All hay 
> contains dust, especially if the cutting is done really short and 
dirt 
> is mixed in with the hay, and if the horse doesn't have its head down 
> (as it evolved to do while grazing), the dust can go right down the 
> airway instead of being flushed out by the nasal secretions. Feeding 
> off the ground and/or mounting hay feeders low IMO is the best 
> protection against developing COPD from hay.
> 
Corrie coughs up big lumps of thick phlegm even if the hay is on the 
ground. I have to wet it down first. She won't even go in the stable if 
the hay is dry. You would think she is being gassed. It is also easier 
for her to chew when it's wet.
Sue UK

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