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.
Belgian Malinois. The Belgian Malinois is a medium sized dog breed weighing between 50 and 65 pounds. The Belgian Malinois was once considered a part of the Belgian Sheepdog breed, until it was recognized as a separate type in America in 1959.