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.
Pomeranians are very small dogs that average in size between 3 and 7 lbs. Pomeranians originated in Iceland. During that time, they were solid white with thick, heavy coats and reached up to 20 pounds. They were used then as sled dogs.