If it will only prevent the animal to look (target) you, it will not prevent it from coming closer.
If it will actively make them go away, then I am afraid of exploiting that, like to stuck a tiny place with bunch of animals or that you can easily make herbivores to move into aggro or to a place it was not expected. What about animals surrounded by homins with such effect? Also animals have some routes and areas which makes it more complicated, even if it will be done some smart way. Plus this will be exclusive for one faction (however this is not important on Atys, the "land of plenty" :/).
If it will actively make them go away, then I am afraid of exploiting that, like to stuck a tiny place with bunch of animals or that you can easily make herbivores to move into aggro or to a place it was not expected. What about animals surrounded by homins with such effect? Also animals have some routes and areas which makes it more complicated, even if it will be done some smart way. Plus this will be exclusive for one faction (however this is not important on Atys, the "land of plenty" :/).