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 St. Bernard is one of biggest dog breeds, with adult males measuring approximately 90 centimeters (35 inches) and weighing up to 120 kilograms (264 pounds). They have been known to be very dependable, and especially strong as they are some of the strongest dogs in the world.