Actually it is a spiritual soul. The word soul itself implies spirit. I think the difference for which you’re looking is between a material soul and an immortal soul. Human beings have an imortal soul and animals have a material soul. A material soul dies when the the creature dies.
As to being moral creatures capable of sinning, that is not the product of having a soul. It is the product of having a conscience and free will. The lower animals do not have a conscience and free will. They have consciousness, which is different from a conscience. They act on two things: instinct and conditioning. Neither are free choices. Human beings have both conscience and consciousness. We act on three things: instinct, conditioning and choice. Choice is where sin and virtue enter the picture. We have a conscience that allows us to tell the difference between good and evil and we have choice that allows us to do one or the other.
Fraternally,
Br. JR, OSF