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.
The cause: Some of the causes of vomiting in dogs include digestive issues, diabetes, and kidney failure. If your dog solely vomits foam or a yellow or clear liquid, it could indicate acute gastritis, pancreatitis, intestinal blockage, or other issues.