The pericardium is a tough, layered sac that wraps around the heart. When the heart beats, it slides easily within the sac. Normally, only 2 to 3 tablespoons of clear-yellow pericardial fluid are present between two layers, which lubricates the heart's movements within the sac.
Biewer. The Biewer (pronounced Bee-vair), also known as the Biewer Terrier, Biewer a la Pom Pon, Biewer Yorkshire Terrier, Biewer Yorkshire, or Biewer Yorkie is a variant of the Yorkshire Terrier.
Yorkie Mix. If you would like a small dog that is loving and loyal, a Yorkie mix is a great option. They are often called Chorkies because they crossed with the Chihuahua and Yorkshire Terrier. Since the breeds are different temperaments, it is hard to predict what the personality of the breed will be. It is very common for a Yorkie mix to have high energy as they enjoy barking and running.