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.
On average, Newfoundlands are not the worldâs biggest dog breed by either height or weight, but exceptions occur. Some of these dogs can top 200 pounds and measure six feet from nose to tail, putting them on par with some of the worldâs largest dogs.hree of the worldâs largest dog breeds were involved in the creation of the Leonberger: the Newfoundland, St. Bernard and the Great Pyrenees. They inherited the lifesaving and water rescue abilities of their progenitors and are used today as lifeguard dogs.