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.
It has a gray, black, and tan coat. The breed is nicknamed Yorkie and is placed in the Toy Terrier section of the Terrier Group by the Federation FÃ©dÃ©ration Cynologique internationale and in The Toy group Or Companion group by other kennel, clubs including The American Kennel, club although all agree that the breed is a. terrier