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Hi, I can help you with your question today.
For a dog his size, 1000mg is appropriate, and would be given twice daily for several types of fungal infections.
I'm not sure that I would support its use in Flash based on your description.
I would not consider loose skin suspicious for a fungal infection, so I'm a bit mystified!
Did you have any concerns about his skin prior to the appointment? Or was this something pointed out by your vet?