The body of an animal has no relation to a rational soul, as the human body has.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic body soul
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/19950/pg19950-images.html

Context

“"He that raised up Jesus from the dead shall quicken also your mortal bodies, because of His Spirit that dwelleth in you." Reply Obj. 1: The spiritual sense of grace does not reach to the body first and principally, but secondarily and instrumentally, as was said above. Reply Obj. 2: The body of an animal has no relation to a rational soul, as the human body has. Hence there is no parity. Reply Obj. 3: Although Christ drew the matter of His body from other men, yet all draw from Him the immortal life of their body, according to 1 Cor. 15:22: "And as in Adam all die, so also in Christ all shall be made alive."” source