Mt vet has advised putting a fly mask on my little dartmoor that cover her nose aswell and I bought one of the shires ones in a Small Pony but was enormous! I can't seem to find any small enough that dont touch her eyes.
Cashel used to make yearling/mini size fly masks which I used for a Welsh section a with a tiny head. Not sure if they do them to cover the nose as well but you could probably add a piece of fabric yourself.
Ive got an Equilibrium fly mask for my little companion pony and it fits really well and she doesn't get it off. I bought one for my mare as well. They are well made and fit well without pinching over the poll like the Le Mieux ones did to my mare.
