My opinion is that animals and humans are just a different species in the same category..... Some animals show tears when they are sad ( like elephants and dogs...) and they are able to grieve to their deaths. Pets are children in our modern society, with all the care a child gets... and so on. In the jurisdiction system animals are a thing - in order to make it easier in courts. For me it stands like this: They can give love and affection, which would be impossible without a soul. I know, I know.....the word soul is a religious word, but it fits!
The disciples came to him and asked, "Why do you speak to the people in
parables?" He replied, "The knowledge of the secrets of the kingdom of heaven
has been given to you ... For I tell you the truth, many prophets and righteous
men longed to see what you see but did not see it, and to hear what you hear but
did not hear it." (Matthew 13:1-23)
"The kingdom of heaven is like treasure hidden in a field, which someone
found and hid; then in his joy he goes and sells all that he has and buys that
field." {worth all you have} (Matthew 13:44-46)