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.
Â­Golden Retriever. The Golden Retriever is a gorgeous dog. They have long beautiful and fluffy blonde or golden fur, and they are a joy to have around. They are one of the most popular large dog breeds around. They rank extremely high in intelligence, and are very easy to train.