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.
The Biewer is 20-23 cm (8-9 in) tall and weighs 2-3 kg (4-7 lbs). Biewers have a small, flat head, level or scissors bite, dark, intelligent eyes, and small, highly set, V-shaped ears. They have a level back and tail carried high.