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 coloration of a Yorkshire Terrier Chihuahua mix can vary and may even change from the time it is a pup to being a full grown dog. Yorkie Chihuahua mix puppies may be white, black, brown, tan or red. A Chihuahua mixed with Yorkie has bright eyes, a long body, and a small nose and feet. The ears may be erect like those of a Chihuahua. When a Chihuahua mix with Yorkie becomes an adult, its weight may reach up to 15 pounds.