The phrase "animal soul" refers to the innate or instinctual nature that humans share with animals. It represents our primal desires, emotions, and instincts, similar to those found in animals. Full definition
Was there a progression from animal souls to human souls? (faith.org.uk)
If the term «human nature» is used meaningfully, it must point to characteristics common to all human souls and absent from all other animal souls. (religion-online.org)
I hope you will join me in honoring Cooper and all the special animal souls we have loved by donating to help those fox terriers most in need. (foxterrierrescue.net)