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.
Large to Medium Dog Breeds. Large to Medium dog breeds weigh around 35 to 65 pounds, approximately. These breeds are home loving dogs and love being around families. Some of these dog breeds are usually related to guardian activities and are quite ideal to protect your house and family from any intruders or burglars.