Dogs are angels without wings.

If we all had the Dog gene, we would all be friends. We would all get along, so much more than we do now. We teach our Dogs how to sit, stay, come. But Dogs teach us something more important, they teach us what unconditional love is and when they leave us, we learn how to be human. If only they could stay with us longer. My life has been richer because of the Dogs in it.

https://www.amazon.com/Dogs-Purpose-Novel-Humans