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.
10 Large Dog Breeds That Are Gentle Giants. Dogs such as Mastiffs and Great Danes might look intimidating, but many large and giant breeds are actually total softies. Beneath their massive bodies and, in some cases, copious fur, many are calm and gentle dogs who often just want to snuggle on the couch. Even if they are taking up most of the room on it.