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 Pyrador is a mix of the Labrador Retriever and the Great Pyrenees breeds. The result is a large, graceful dog with a double-coat that can be solid white, yellow, black or brown. The Great Pyrenees is a livestock guard dog, bred for its sturdiness, attentiveness and fierce protective instinct over its ward, whether human or animal.