Being sent back to earth to try again as a lower form of life, seems to make more sense.
The spirit guides I have listened to say we do not reincarnate as animals, nor do animals incarnate as humans.
Each species evolves to perfection in its own right over many incarnations.
Perhaps your spirit guides are demonic.
That is what most Christians believe, but I could feel some psychic energy myself and the feeling was good.
Positive energy feels warm, and negative energy feels cold. I could tell that the spirits I spoke to were not evil.