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 Belgian Laekenois is a medium sized dog that weighs between 50 and 65 pounds. The rarest of the four Belgian Shepherd dogs, the Belgian Laekenois is a sturdy, well-proportioned medium-sized dog with a rough wire coat that easily distinguishes it.