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.
But the large-sized Labrador Retriever is still the number one breed in the U.S. Fashionable dog breeds will come and go, but the biggest dog breeds seem to have staying power (consider the Mastiff). And, though itâs hard to believe, these gigantic breeds are really as big as a horse â OK, maybe a miniature horse.