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.
At least three big breeds went into the creation of the Leonberger: the Newfoundland, the Saint Bernard and the Great Pyrenees. No one really knows the âcanine recipeâ used by Heinrich Essig, but the result was a dog who at maturity stands 28 to 31.5 inches and weighs 120 to 170 pounds.