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.
There are many possible causes for a cat to feel lethargic with an increased respiratory rate which may include infections, gastrointestinal obstruction (increased breathing rate due to pain), anaemia (less red blood cells lead to an increase in respiration) among other causes; you should keep a close eye on Buddy, but it would be wise to visit your Veterinarian to help narrow in on a specific cause for the lethargy as there are many possible causes. Regards Dr Callum Turner DVM

A few people experimented with breeding F. chaus to F. s. catus in the late 1960s and 1970s. Their intention was to provide a sensible alternative to keeping non-domestic cats as pets. However, the Chausie breed did not truly begin until the 1990s, when a dedicated group of breeders named the breed "Chausie" (after Felis chaus) and developed a planned breeding program and goals.[4] These breeders asked for and received registration status from TICA in 1995. The breed worked its way through the New Breed Class from May 2001 through April 2013, and became TICA's newest Championship breed on May 1, 2013.[1] Chausies are now being bred in both North America and Europe. The breed has begun the new breed recognition process in the World Cat Federation (WCF).
Historians and cat lovers in Scandinavia and England worked tirelessly to map out a bloodline foundation for the cat breed. Records show that the first Archangel Blue appeared in 1875 to compete against similar blue breeds at the London Crystal Palace. One newspaper said that the Archangel was “particularly furry”, “very handsome” and “has similarities to that of the wild grey rabbit”. Before long, word was spreading around about the Russian Blue.
When the Russian Blue cat sees his favorite family member, though, it’s a whole different matter. This cat will follow the individual around the whole house and can sometimes hitch a ride on that person’s shoulder. The Foreign Blue greets the owner at the door and is sensitive to your mood, i.e., with playtime or just by settling down next to you. Owners rarely hear the cat’s voice unless it’s mealtime. Some of the things an Archangel Blue appreciates are a hearty game of fetch, a window with a great outdoor view and pats on the head.

Breeding of Russian Blues took a lot of years and tweaking as many breeders had different preferences as to what exactly they thought the Russian Blue should be like. The breed became very varied and finally, North American breeders began to import Russian Blues from Britain and the breed began to stabilize. Russian Blues are known for their skittish, shy personalities and struggled to perform in cat shows. This problem led to a decline in popularity but breeders worked hard to carefully cultivate the desired personality and, since the 1990s, Russian Blues have done much better in cat shows and have become much more popular among fanciers.	

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.
If your cat is having difficulty breathing, this can be a life threatening emergency. It is important to have your cat seen by a veterinarian as soon as possible. You will need to give a thorough history of your cat's health, onset of symptoms, and possible incidents that might have preceded this condition. During the examination, the veterinarian will carefully observe how your cat breathes, and will listen to its chest for evidence of a heart murmur or fluid in the lungs. Your cat's gum color will be carefully evaluated as well, since the color of the gums can indicate whether oxygen is being delivered to the organs (hypoxemia) effectively, or if it there is a low red blood cell count (anemia). Your veterinarian may try to get your cat to cough by pressing on its windpipe. If your cat is having extreme difficulty breathing, the veterinarian will give your cat oxygen to help it breathe before doing any more tests.
Lethargy and increased respiratory rate are not specific symptoms as they are shared with many conditions; however I’m concerned that they are a common sign that an animal is in pain, but without examining Marilyn I cannot say whether she is in pain or there is another cause for the symptoms. You should visit your Veterinarian for an examination to be on the safe side especially if this has been going on for a day or more. Regards Dr Callum Turner DVM 
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