All that is created by God is good. Even the first people were good , and they had a close relationship with God. This is why we are using the white colour which symbolises the good and pure nature which God has given us.
Unlike the animals we do not only consist of Body and Soul, but we also have a Spirit. Even when our body dies our spirit lives forever. We can plan for the future and create completely new things which is something that the animals can't. The animals merely follow their instincts, but we humans have got our own free will. Thus we have an eternal responsibility which the animals do not have.
All people also have religious need. This is something which the animals lack. Have you ever seen a dog pray or a horse which attends church?