In the third century B.C there was a greek philosopher named Chrysippus who reported seing a dog chading a rabbit. After the rabbit had gone out of sight of the dog, the dog came to a fork in the road. Sniffing one path revealed no scent, and so the dog bolted down the other path without even sniffing. Chrysippus concluded that dogs had the ability to reason, seeing the dog’s deduction that the other path had to be correct since the first was not.
As I understand it, the Catholic position is that only humans have the ability to reason. What would one call the attribute displayed by Chrysippus’ dog, and how is this different from reasoning? If Chrysippus’ dog (and dogs in general) actually do behave this way, does this not display a level of reasoning above, say, mentally disabled human beings?
This being said, can reason still be given as evidence for the soul? Did it serve as evidence in the first place, or am I misunderstaning something?