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.
From the U.K., Zorba weighed in at 343 lbs and measured almost 8 feet long from nose to tail. English Mastiffs are considered the biggest dogs as they are usually the heaviest dogs with weights over 200 lbs. not uncommon. Did you know that the Irish Wolfhoud is one of the largest dog breeds.