Sense people have brought up waterbottle, what about Stop That spray? It doesn't leave a wet face, and is more the sound that gets to dogs from being locked on. I think pennies in can make them afraid of large sounds, and water in the face will teach them to associate water with that too. Could also try calming treats, and exercising him more. But ultimately having a trainer come into your home will be able to give you the best advice.
__________________ Lana  , Draco 
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