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.
As the Yorkie terrier is one of the world's smallest dogs they do have special needs, and although a dog with a big spirit they are generally even tempered. As they are excellent guard dogs they can have a tendency to bark which is annoying for the neighbours.orkshire Terriers are agile, graceful and an alert with a high level of intelligence. However they can have birth defects and they are notoriously difficult to housetrain. Whilst these are negative aspects that do not mean that a Yorkshire terrier is not for you.