Although the official, permissible outcrosses for the Chausie breed are the Abyssinian and the domestic shorthair (no recognizable breed), in practice any kind of purely domestic outcross can be used. TICA rules only dictate that cats must be a certain number of generations removed from the jungle cat ancestors and have three generations of registered Chausie ancestors to be eligible for competition at shows.[1] Consequently, a variety of breeds, albeit usually lively outgoing breeds (see below), were used to develop the Chausie breed and continue to be used occasionally as outcrosses. This has given the breed a diverse and healthy genetic foundation.
Finally, the Governing Council of the Cat Fancy recognized the breed, and in 1912, the Russian Blue was granted a class of its own. Any progress in the breed's popularity was to come to an abrupt end, when World War II was waged over most of Europe, killing most of the Russian Blues. Breeders intent on bringing the Russian Blue line back began crossing the cats with British Blues and Bluepoint Siamese. At the same time, Scandinavian breeders crossed the blue cats from Finland with similarly colored Siamese cats.
Any changes in breathing should be concerning, you should keep a close eye on Lucy to see if it passes; if it seems like she is having difficulty getting enough oxygen or her gums are pale you should visit a Veterinarian immediately. Infections, laryngeal disorders, airway obstructions, tumours, poisoning, anaemia among other causes may cause respiratory difficulties. Regards Dr Callum Turner DVM
Without examining Squish I cannot say whether there is a cause for concern or not, but generally if she is otherwise healthy and active when awake and isn’t showing any signs of exercise intolerance I would keep an eye on her. It may be that her sleeping position or a partial obstruction of the airway whilst resting may be causing an increase in respiratory effort; you should record her sleeping and visit your Veterinarian for an examination to be on the safe side for a little examination. Regards Dr Callum Turner DVM
This is about my cat. He was fine when he was a kitten other than being feral and not used to people. But about two months ago, he started doing this thing where he is breathing fine and all one minute and the next it sounds like his breath is coming out in quick bursts almost like coughing. And it always goes for about 8 or so bursts of breath. Is this something I should take him to the vet about ?
As the CFA further explains, the Russian blue cat made its first public appearance in 1875 in a very regal way: exhibited at London's Crystal Palace as the "Archangel Cat." The Crystal Palace was constructed under the leadership of Prince Albert, husband of Queen Victoria, as the location of The Great Exhibition in 1851 and thereafter was used to exhibit items of interest (living and otherwise) to the people of Victorian London, and the attractions held international appeal as well. By middle of the nineteenth century, "cat shows" had become regular and popular events.
Thank you for your email. It would be best to have him examined by your veterinarian, yes - if he had any type of underlying heart problem that you weren't aware of, they stress of being restrained may have caused fluid to build up around his heart and lungs. They may want to take an x-ray to make sure that he is okay, but it isn't normal for him to still be breathing heavily and coughing 2 days after the event. I hope that he is okay.
One of the features of the short, silky, dense coat is the plush feel and the lack of constant shedding. The coat color is an even, bright blue, and each guard hair appears as if dipped in silver – giving the Russian a silvery sheen and lustrous appearance. Russian Blues are registered in only one color – blue – and one coat length – short. In contrast to the blue coat, the Russian Blue has large, rounded, wide-set eyes that are vivid green. The head shape is a broad, medium wedge with a flat top and straight nose in profile. Large ears are wide at the base and set rakishly toward the side of the head. The Russian Blue is a medium-sized cat, fine-boned, long, and firmly muscled.

A stray cat showed up at my house a couple days ago. She is very thin and I've started her on small throughout the day. She is eating, drinking, voiding, and stooling okay. Eyes, ears, and nose are all clear. The only major thing I've noticed is rapid breathing when purring or stress (loud noises make her skittish). I have pets of my own and really cannot afford a costly vet visit, and our local shelter and a rescue are overwhelmed with companion animals at this time. I've started her on antibiotics and am keeping her isolated from my own pets. My daughter has asthma and this looks very similar. Any advice? I've found out that her previous owner passed away and a neighbour tried to bring her to her house, the cat bolted and they couldn't find her, 3 weeks later she showed up at my place. She is a spayed 5 year old female who was up to date on shots. 

My cat, Arwen, just came out to the living room limping badly with her front right leg kinda knuckling over. The leg and paw is cool to the touch in comparison to the rest of her body and her shoulder blade is just flat. I pinched her toes a little and there was no reaction. She's also breathing kind of shallow and fast with it seems like she's breathing from her stomach not her chest. She is crying a little bit but not when we touch the leg, onky when she tries to move around while laying down.
Black grizzled tabbies are unique to the Chausie breed among domestic cats. The grizzled pattern comes from the jungle cat; it is never found in domestic cats unless they have F. chaus ancestors.[8] The kittens are often born completely black, although occasionally they may have a bit of light colored fur on the chin or neck at birth. As the kittens get older, they begin to look more and more like tabbies. However, they are tabbies with black on black markings. That is, the background color is a sort of dark brownish black, and the markings, such as the mid-line stripe on the spine, are pure black. In addition, alternating bands of off-white appear on individual hairs in the background color. The bands are along the middle of each hair. The root of each hair is mousie gray, while the tip of each hair is black. The off-white banding or "ticking" usually appears first on the neck, chin, and belly, as well as the insides of the ears. Later, the grizzling will often extend up the sides from belly to almost the spine. In the most heavily grizzled cats, the grizzling extends over the back of the neck, on the face, and even on the legs and tail. Usually the grizzling is complete by age 3 years. The effect in the best cats is spectacular. Grizzling does have a wide range of expression, however, and some cats never have more than a few banded hairs in the ears or in one spot on the belly, occasionally not even that.

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. 
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