Memory loss more common in people with blood type AB. Several research studies have pinpointed lifestyle changes individuals can make to prevent memory loss, such as keeping stress and blood sugars low, and not smoking.
A dog will shake its head under normal conditions for a few reason, such as when the dog has just gotten out of the water or to shake seeds or burrs from its ear. Even a dog hair can irritate the dog enough to make it shake its head. When your dog shakes it head, it is important to check for any foreign objects, allergic reaction and bites in its mouth, throat and ears if you can.
Many dogs love swimming, and you'll notice them shaking themselves when they get out of the water. This is an excellent way for the dog to dry off, though also a good way for bystanders to get wet. Short-haired dogs usually dry off quicker than long-haired breeds.