all_fours animal_genitalia animal_penis annoyed_expression antlers big_penis blue_eyes blush cloven_hooves equine_penis erection feral genitals hooves horn looking_at_viewer male outdoors penis saddle scales solo thick_thighs vein veiny_penis white_body white_scales nonimousmate cervid dragon hybrid mammal hi_res
Still looking for a good fit for a hybrid draconic mount.  
This time I used a deer/dragon hybrid.