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.
Vomiting and Diarrhea. A lot of parasitic infections in canines will cause vomiting and diarrhea. These symptoms are due to the fact that the parasites, located in the digestive tract, will cause irritation and interfere with the normal digestion process. Vomiting and diarrhea may not be present in dogs that have heart or lung worms. Occasionally, the vomit or the feces may have blood or parasites.