I think in what they call something like the Cave books, (it is claimed they should be part of the Bible), it is said that prior to the fall, man and animals were of one accord = communication and that was cut when tossed out of the Garden.
That aside, I believe God would know exactly what animals communicate.
Basically, the entire Bible and it's message, the key part is Communication --> Good verses Evil and ALL tied into, centered around Words, good and evil.
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I can't find any information about the "Cave Books". Any clues?
God and Satan apparently spoke through animals and we know that animals have personalities, have memories, and are capable of logical thinking and learning, and since God created them it would not surprise me if they also had spiritual experiences.
It would also not surprise me if some animals were capable of being demonically possessed.
There's a viscous dog down the road and I'm sure it's one that is.