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 Silky Terrier dog breed exemplifies the expression âsmall dog, big personality.â Weighing just eight to 10 pounds when full grown, heâs tough and confident, perhaps because of his heritage as a hunter of small prey. Beneath the feistiness, however, is a loving companion dog who loves to stick close to his person.