Is it still wet? If so, as it dries, brush it with a soft brush (like this one I use on my animals (also, it's available from Amazon), not a comb or one with bristles. Soft paint brushes (like this, which I know AC Moore sells) can also work, especially for small areas/animals.
I brush them (roughly) once I get them mounted and a few times while they're drying, and then after they dry.