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.
Longhaired St. Bernard Dog. The St. Bernard is a giant dog, with the largest individuals reaching over 140 kg (310 lb). The average weight of the breed is between 65â120 kg (140â260 lb) or more and the approximate height at the withers is 70 to 90 cm (28 to 35 in). The coat can be either smooth or rough, with the smooth coat close and flat.