What's the surprise here? If anything I would expect animals to be even more emotional than humans. Emotions are something primal, something that came to be before conciousnes. Animals are emotional and all they ever do is act on their emotions, whether that is: hunger, fear, joy, lust, etc.

The human-specific part of mind is the rational part, planning, reflecting, self-correcting, etc. Animals never come close to humans in this regard.