The principles of learning are universal across species.
The more we learn of the true nature of non-human animals, especially those with complex brains and corresponding complex social behaviour, the more ethical concerns are raised regarding their use in the service of man—whether this be in entertainment, as ‘pets,’ for food, in research laboratories or any of the other uses to which we subject them.
The most important thing in filmmaking is to stay true to your vision, no matter the obstacles.