I have encountered a number of dogs who only want to chase and select individual sheep, apparently for dinner rather than to control the movement of stock. These dogs are more suited to other dog activities. Some Bouviers who start tentatively will become very enthusiastic with repeated opportunities to work. My training experience has been primarily on sheep. Other trainers tell me that their Bouviers wil readily switch to cattle.
Some dogs do an excellent job with ducks or geese.
When considering herding as an activity for Bouviers, there are several factors to consider. Soundness Soundness is the basic consideration. Dogs with unsound hips or other skeletal problems may experience pain with running and quick turning. These dogs may not want to work at all, or perhaps may grip inappropriately as they tire. Body Type Body type may also be an influence.