Is she bred? If so, the fawn could be pushing on a nerve, and if so, Dex could cause her to abort. If she is not bred, it is probably trauma of some sort, and I agree, give her Dex. Dosages can range from 1cc to 10cc's, or even more in some situations, which is why I am guessing stevel hesitates to offer up a dosage. There is a very broad range of appropriate dosages for a specific need, so it is hard to advise you on how much. Can you give more information or post pictures? Then maybe someone on here can help with a dosage.