I wonder what PD means here? I guess that since humans, at least long for God in a certain way, it follows that everything else does the same (because such longing is a natural instinct?)
It's an interesting idea because you could interpret this longing in a lot of different ways - the drive for survival, for knowledge (PD's claim), for love, for happiness - that each could be construed as yearning for divinity, so there's some ambiguity.
Do animals have any proven conception of happiness beyond physical pleasure - ie, can they demonstrate mental, not just physical satisfaction, like humans? I think if yes, that would be an interesting (to me at least) fact supporting PD's idea. (asking as someone who's never had a pet lol)