inhaler
we had to use an equine mask to nebulise my old chap with COPD a few years ago. He's much better now so hasn't needed it for quite a while ! (Move to Scotland

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However, our vet at the time said it was quite difficult. So either ponyvet has a different experience or perhaps the masks have changed ?
He was ok for the first few times, but then really started to object. I could not get the mask anywhere near him. I think the spray was making his nose sore. So he associated the mask with pain and there was NO WAY he was on for that.
You do the most ridiculous things... the way I got around it was to use a T-shirt. Put his nose through the neck hole, then put my hand through one the arm holes. I fed the nebuliser end with the outside hand, and controlled it near his nose with the inside hand. Then I could hold him, and hold the spray close enough to his nose to have an effect, but I could control it much better.
Its sounds crazy (and is not so easy to explain) but it did work, and he did seem to find it easier to take. I think by getting the nebuliser to the right place, rather than just at the bottom of the mask, I could reduce the bad effect and optimise the good effect.
Must have done something right 'cos he doesn't need it anymore. Still has COPD but with plenty of air, soaked hay, and rubber matting, he's fine.
We tried Horsehage/haylage - he turned it down. Seems he doesn't read the vet books .
What bedding is next door seems to be very important. By the way, we also tried hemp bedding and it seemed to be a problem for him - don't know why.