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.
â No Avocados: Most parts of avocado plants, including the fruit, seeds, leaves and bark-like exterior skins contain persin. Naturally ocurring persin can induce heavy vomiting and diarrhea in dogs, and too much of it can lead to serious health risks. â No Pear, Peach, or Plum Pits: these have the same negative effects as other fruit seeds and pits that can block the digestive tract.