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.
Most Popular Dog Breeds Pugs. The other names of this most popular dog breeds are Chinese pug, Dutch bulldog, Dutch mastiff, Mini mastiff and its country of origin is China. Pugs are very small dogs with a wrinkly, short-muzzled face, and curled tail. It has developed muscles and comes in different colors. 9.