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.
A strong work ethic dog, the Bergamasco is a big fluffy breed with distinguishing characteristics of its coat. The hairs seem to be âdog hairs, âgoat hairs, while wool can also be noticed. These hairs combine to form black or gray mats which grow throughout Read More. Image.
Last but not the least onto my list of biggest dog breeds in the world is none other than a Tibetian Mastiff. They grow to a height of 24 to 26 inches, weighing about 85 to 140 pounds. They usually have a life span of about 10 to 14 years. Tibetan Mastiffs are highly intelligent and independent thinkers.