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.
The Flat Coated Retriever Dog Breed has a personality and temperament that is intelligent and energetic. While this breed requires plenty of mental stimulation and exercise, Flatties are wonderful family pets and will bond very closely with family members. They also get along great with other pets.