The Chausie was developed from hybrids of the Jungle Cat (Felis chaus), the largest species of the genus Felis, found in Asia. They can grow up to three feet long and weigh 35 pounds, but are generally around 18 pounds. Like the hybrids that developed into the Savannah and Bengal breeds, the males of the first few generations are usually infertile, and the F4 and F5 are considered truly domestic and suitable for cat shows. TICA classifies the Chausie as a championship breed.
As the name suggests, this breed is believed to have originated in Russia. It is widely believed that British sailors, fascinated by this breed of cat, brought them home from the White Sea port town of Archangel (Arkhangelsk) in northern Russia. The presence of a warm, thick coat suggests that they were long accustomed to surviving in a cold climate. As mentioned earlier in this article, there has been some suggestion that the Russian Blue lived in the wild and was hunted for its fur. Whether these stories are true or not remains pure speculation.
Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow.  It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.