HERE. Some highlights:
"Animal is the one who phenomenally shows to have a soul, by being drawn to things, or pushed away by them. The animal is not like the rock who stays where it is, no matter what, or the water, which indifferentially seeks the easiest route. Not even like the plant, which shows some kind of sensitive reaction, but which never moans for pain, or jumps for joy. The animal is the most expressive creature of them all. It cannot resist to react visibly or audibly to what it meets. Even not when keeping things in with grand mastery. So what is an animalist? It is someone who feels that the human being is not only not alone for being part of the world of ongoing translation between all creatures, but still less alone for belonging to a large family of expressive creatures."
"The animalist is by definition an animist, in my view – for I have never met an (non-human) animal who didn’t treat the whole of visible reality as being inhabited by spirit/soul. No fools among animals."
Readers may be interested to see my "If Cats Could Talk" post HERE which considers what the "otherness" of animals might reveal; and my link to "The Soul of All Living Creatures" HERE.
For more on panpyschism see a link to Charles Birch on the soul HERE with a post "Is Matter Mental?", and posts on Plato and Hartshorne on the soul HERE and HERE.