1 Certain parts of the brain shrink, especially the prefrontal cortex (an area at the front of the frontal lobe) and the hippocampus. 2  Both areas are important to learning, memory, planning, and other complex mental activities.
Some big, fluffy dog breeds are the chow chow, the samoyed, the standard poodle, the old English sheepdog and the keeshond. The abundant, fluffy coats of these dogs require constant care. Keep Learning.
The Chow Chow is a large, stocky dog. The two most distinctive features of the Chow Chow are its blue-black tongue and its almost straight hind legs, which makes it walk rather stilted. The head is large and broad with a flat skull. The muzzle is broad and deep.