The TICA Chausie breed standard allows three colors: solid black, black grizzled tabby, and black (a.k.a. brown) ticked tabby.[8] Because the Chausie breed is relatively new, Chausies are still frequently born that have a variety of other colors and patterns, and they make wonderful pets. However, only the three permissible colors are considered ideal. Only cats in the three permissible colors can be entered in new breed classes at cat shows, and only the three colors will be eligible eventually for championship classes. Gold or yellow eye color is preferred, though yellower and lighter shades of green are allowed.

Smooth, medium wedge, neither long and tapering nor short and massive. Muzzle is blunt, and part of the total wedge, without exaggerated pinch or whisker break. Top of skull long and flat in profile, gently descending to slightly above the eyes, and continuing at a slight downward angle in a straight line to the tip of the nose. Medium in length. Length of top-head should be greater than length of nose. The face is broad across the eyes due to wide eyeset and thick fur. Muzzle smooth, flowing wedge without prominent whisker pads or whisker pinches. Neck long and slender, but appearing short due to thick fur and high placement of shoulder blades.
Los Angeles cat breeder Judy Sugden has been working since the late eighties to breed a house cat that resembles a tiger. The result is the Toyger, a registered breed that has a lineage beginning with domestic shorthairs and Bengals selected for their markings. Toygers are now available from breeders all over the world. The breed is still in development, and TICA now has the toyger classified as a championship breed. 

Thank you for your email. I do think that there might be more going on than stress, and kittens are prone to infectious diseases. If you don't trust that veterinarian that you saw, it would be a good idea to find a second opinion, even if you have to travel a bit to do so, as he could have a problem that needs to be treated. You can also call your veterinarian, let them know that he isn't getting better, and see if they have any other recommendations for him.
Those animals were then bred indiscriminately, and many purposely inbred for traits such as white coats, tiny size, and docile (read retarded) temperament. None of the exotic cats in wild hands can be traced back to the wild, other than local cats, cougars and bobcats, who may have been snatched from the wild in the U.S. For that reason they can never be bred for introduction back to the wild.
Russian blue cats are highly intelligent animals and require physical and mental stimulation, so it's important to give them access to toys at all times. They retain a strong hunting instinct, so a feathered fishing pole toy is the perfect plaything. Consider storing these types of toys in a cat-proof spot because: (a) your kitty will tear it to shreds, and (b) she may eat the feathers and/or the string, neither of which are good for her digestive system or overall health.
Chest x-rays and standard blood tests may be indicative of valley fever but the condition is only confirmed with a specific test for valley fever; all other indicators may say valley fever but we still need the test to confirm. However if Nunzi has any response to the antifungal treatment then it adds another tick in the box for valley fever. Regards Dr Callum Turner DVM
There are various different causes for rapid breathing which may include infections, pain, heart disorders, dehydration among other causes; a cat’s respiration should be below 30 breaths per minute when at rest but if it is significantly above this rate at rest I would suggest visiting your Veterinarian for an examination to determine a cause. Regards Dr Callum Turner DVM