&gt;Far more interesting is why a chihuahua with a walnut-sized brain is just as smart as an irish wolfhound that has a brain that masses about as much as a whole chihuahua!<p>chihuahua has the largest among dogs ratio of brain to the body.
Another thing to note when size of brain is discussed is the Einstein&#x27;s brain - smaller than average, it had greater ratio of glial&#x2F;neuron cells and was much more interconnected among other things.