There are animals that have emotions while lacking the capacity to reason (in our sense), but there are no reasoning animals that do not also have motivating emotions. Although not everyone agrees, I think it’s clear that reasoning has no ends of its own, and in this sense reason is, as Hume famously declared, a “slave of the passions.” (“Passions” here refers to emotional processes in general, not exclusively to lusty feelings.)
Reasoning is based on emotional info as well (not ony logic or something), e.g Phineas Cage with the frontal lobe injury that made him not have proper emotional behaviour also did bad or nonsensical decisions where he needed (logical) reasoning. Our emotions help us do reasonable decisions.
