This is true of hatred, for example, but there is considerable evidence that in man hatred may be at times in some strange way soulish rather than spiritual, almost on the nature of a physical poison which can have a profoundly disastrous effect upon the whole physiological system. The same appears to be true of anger, and probably of fear. Since the whole central nervous system is involved, the soul is peculiarly tied in its existence to the body. For this is how we are aware of the existence of both ourselves and others. Returning to the animals for a moment, it is clear that they, too, share something of man's compound nature.
Some animals have a gentle disposition, i.e., a docile spirit.
Others of the same species may be vicious and unfriendly by nature. The experiments of psychologists with animals have shown that they share many of man's reactions to stresses imposed upon the spirit, and can be made neurotic or sociable, by conditioning. We see this in domestic animals, and especially in those which have become pets. Recent experiments have shown the profound effect which fondling and loving care can have in contrast to harsh or even indifferent treatment. There is no doubt that the temper of animals varies widely and that this has little to do with the senses they possess, except in so far as these become means of communication.