Jeox;1815853; said:
ok, i'm not really religious, but if satan took the FORM of a snake, why would that make the snake evil? If he took the form of a puppy, would puppies be evil?
Yes and no. Satan can only possess us if we let him. Since all humans are born into sin, this is something everyone has to deal with.
When a demon possesses someone, its not like they're completely taking over your mind and body and making you do things against your will, in which you're completely powerless. Its really more of them (I know its cliche, but)...leaning over your shoulder and offering suggestive thoughts. Ultimately, it is our decisions and our will what dictates our actions. I'm sure some of you have heard the phrase "the devil made me do it! it wasn't my fault!".....Not the case at all.
Now, some people can become weak-willed enough let "demons" control them; for example, in the control of alcoholism. People let things like that dominate their lives, and the demons just keep feeding those addictive desires into their ear.
However, the good news is, we're just as capable of letting God into our lives the same way; the proverbial angel on your shoulder, if you will...which is not too far off since the Bible says every person on the planet has their own guardian angel.
Cold is simply the absense of heat. Darkness is the absence of light. We don't have meters for measuring coldness and darkness; we just measure the amount of heat or light is present.
Likewise, sin is the mere absence of God. If we don't allow God into our lives, sin takes precedence.
Now, to answer your question specifically, we have to argue whether or not animals have souls to possess in the first place. Perhaps they do, but certainly not to the same degree as we do. Animals have concept of religion, or mortality, etc, so animals can't "sin" as we do. They're not held accountable for their actions.
However, animals can still be possessed to be used as tools to meet an objective. God used a dove to bring Noah an olive twig as sign of hope. He made a donkey talk to get Balaam's attention. He sent two bears to maul some brats for making fun of one of His prophets. Likewise, Satan used the body of a "serpent" (whatever that may have been) to communicate with Eve.