Yorkies are a great breed of dog, but they are still dogs. Most of them are healthy and have a good lifespan. However, some fatal conditions can cause the deaths of these dogs. The most common causes of death in Yorkies include Cardiac Disease – This includes congenital heart disease. They can also suffer from congestive heart failure if they are overweight. Gastrointestinal Disease – This includes conditions such as bloat, liver problems, and gastroenteritis. Neurological Diseases – This includes spinal cord disorders such as paralysis or muscle weakness. Allergies – These can be caused by insect bites, food allergies, or flea allergies.