1. Can an animal ( whether household animal or wild animal) be possessed by a demon?

2. If yes, how can one know?

3. If yes also, will the demon be exorcised out of the animal in the same way a demon is exorcised out of a possessed human being?

NO!

Uptheante:

1. Can an animal ( whether household animal or wild animal) be possessed by a demon?

2. If yes, how can one know?

3. If yes also, will the demon be exorcised out of the animal in the same way a demon is exorcised out of a possessed human being?

Uptheante:
1. Can an animal ( whether household animal or wild animal) be possessed by a demon?

2. If yes, how can one know?

3. If yes also, will the demon be exorcised out of the animal in the same way a demon is exorcised out of a possessed human being?

yes
Take close eyes on the animal.
Pray to God for revelation
If possible killed the animal don't sell it. With prayer and fasting all things is possible in God

Yes, demons do take the form of animals to intimidate or pass a message to humans. With strict rules and limited time, humans can possess the body of some animals like, vultures, cats, dogs, snakes, crocodiles and rats. Like humans, Demons hold on an animal is brief and temprorary, just that the animal would never be the same again. Its mind will be altered. Don't let those aggrieved christians who called themselves atheist decieve you, hidden powers exists everywhere.

The answer is YES. Read Mark 5:1-20, you will see where Jesus casts out legions of unclean spirit from a man, and the unclean spirits entered a herd of swines.