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 National Dog of Cuba and the countryâs only native breed: The Havanese is a small, sturdy dog with a friendly disposition. His wavy, silky coat is profuse, but remains extremely light, insulating and protecting the breed against harsh tropical heat. His coat, which comes in all colors, should remain untrimmed.