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 coat of the Great Dane can be brindle, fawn, blue, black, harlequin, mantle or even striped and is often glossy. The Great Dane is often called the gentle giant. Although big in size, this dog breed is never overtly aggressive.Easy to train and friendly with people, the Great Dane can be a very good companion dog.he Great Dane is a large dog breed believed to have its origins in Germany. The dog breed is believed to be a result of cross breeding between Irish Wolfhound and the English Mastif.