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 causes of vomiting are so varied that sometimes obtaining a diagnosis can be difficult, so itâs important to give your veterinarian as much information as possible and indicate if other signs are also occurring. What to watch for: 1  Frequency of vomiting.2  If your dog vomits once and proceeds to eat regularly and have a normal bowel movement, the vomiting was most likely an isolated incident. 3  Diarrhea. 4  Dehydration. 5  Lethargy. 6  Blood in vomit. 7  Weight loss. 8  Change in appetite. 9  Increase or decrease in thirst or urination.hat to watch for: 1  Frequency of vomiting. 2  If your dog vomits once and proceeds to eat regularly and have a normal bowel movement, the vomiting was most likely an isolated incident. 3  Diarrhea. 4  Dehydration. 5  Lethargy.