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.
Parti Yorkies. Parti Yorkshire Terrier FAQ's. Parti Yorkies are a unique breed because of their impressive coloring. The Parti Yorkshire Terrier is a completely healthy and beautiful purebred Yorkie, and has been in existence for a number of years, but just like anything new, there's a lot of skepticism concerning their rarity.