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.
List of Large Dog Breeds. Large dog breeds are often identified as large-sized dogs that can weigh up to 100 pounds. These over-sized canines make excellent companions and can usually do all sorts of activities with you, running, exercising, hunting, family playtime etc ... While these big dogs can bring more love by their size, there are a few things to keep mind when bringing one into your family.