I answer that, The internal passions of animals can be gathered from their outward movements: from which it is clear that hope is in dumb animals.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic passion hope
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17897/pg17897-images.html

Context

“3: Further, Augustine says (Gen. ad lit. ix, 14) that "animals are moved by the things that they see." But hope is of things unseen: "for what a man seeth, why doth he hope for?" (Rom. 8:24). Therefore there is no hope in dumb animals.
On the contrary, Hope is an irascible passion. But the irascible faculty is in dumb animals. Therefore hope is also.
I answer that, The internal passions of animals can be gathered from their outward movements: from which it is clear that hope is in dumb animals. For if a dog see a hare, or a hawk see a bird, too far off, it makes no movement towards it, as having no hope to catch it: whereas, if it be near, it makes a movement towards it, as being in hopes of catching it.” source