Q: #134. Can animals be demon possessed?
A: Jesus showed us that this is certainly possible when He cast demons out of a man and into a herd of pigs (who then went crazy and ran down a steep bank, drowning themselves)(Mk 5:8-13)(Lk 8:32-33)(Mt 8:30-32: says two men not one). I believe we also have an example of this in the Garden of Eden when Satan entered into a snake, possessing it and speaking through it to tempt Eve into committing the first sin (Gen 3:1-5).
I don’t know how common possession of animals is, but we do know it can happen.