Eastern Bloc countries such as the Soviet Union had high rates of population growth. In 1917, the population of Russia in its present borders was 91 million. Despite the destruction in the Civil War, the population grew to 92.7 million in 1926. In 1939, the population increased by 17 percent to 108.
Causes of Chronic Vomiting in Dogs Chronic vomiting can be caused by diseases of the gastrointestinal tract or can occur secondary to other systemic diseases. It is important to try to establish the cause of chronic vomiting.
A dog vomitng blood may be due to a severe stomach or esophagus disorder. Hemorrhagic gastroenteritis is considered the most common cause; which is caused by a number of triggers, but only those that are considered important can cause vomiting as a symptom.auses of Dog Vomiting Blood: Dogs may vomit due to a complex mechanism, controlled by a specialized center in the hind brain. Different factors can trigger a nervous response in the brain which result in nausea, followed by vomiting.