Not much is known about this rare breed; however, it is believed that the Russian blue originates from northern Russia, specifically the Archangel Isles. According to the Cat Fanciers' Association (CFA), cat rumor has it that "the Russian blue breed descended from the cats kept by the Russian Czars. Assuming the Russian blue did migrate from northern Russia, it was likely via ship to England and northern Europe in the mid-1860s." As early as the sixteenth century, recorded history shows that trade ships passed between this territory and the British Isles, and the Vikings were active in both regions centuries prior, but there is no mention of the Russian blue cat until the nineteenth century.
Treating a wild cat as a pet is not a good idea, but throughout history, some have taken servals, caracals, fishing cats, ocelots, and even lions and tigers into their homes. The desire to own a wild animal can have consequences, so cat breeders have used their skills to develop cat breeds that fulfill the desire for an exotic cat without the danger.

Blood work will identify the presence of any infections and will involve a quick needle stick procedure, done in your veterinarian’s office. Depending on the results from a preliminary physical exam, review of symptoms, and blood work, your veterinarian may wish to order imaging of your cat’s chest area. Images such as x-rays or an ultrasound will help identify any fluid buildup, foreign objects, or potential tumors, masses or foreign objects that may be causing the heavy breathing. Depending on your cat, your vet may order a mild sedative be given to your cat to potential limit movement. Your cat remaining calm and still will have a large impact on the clarity of the images.

The slight upturn to the corners of the mouth make Russian Blues appear to be forever smiling. Members of this breed are generally polite, quiet, and well-behaved, for cats. It’s quite easy to teach them to stay off counters and out of off-limit areas; usually a simple “No” will do. However, Russian Blues seem to think politeness should go both ways and take offense at being made to look silly. A dignified cat, Russian Blues can be trusted to know when you’re making fun of them—and they won’t soon forget this breach in manners, either.
There are other reasons, in the real world, why it doesn’t work, which includes the fact that human – big cat conflict is one of the main reasons cats are wiped out of areas. Captive breeding not only selectively chooses animals that are least fit for the wild but also conditions the cats to not fear humans. That increases the conflict and the result is that not only would the offending cat be killed, but likely any wild cat seen in the area would be hunted down and killed in a case of mistaken identity. That escalates the extinction of cats in the wild.

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Aside from the remarkable coat, these cats have large, enticing eyes that are wide-set and are coloured emerald green. Russian Blues are often labeled as “Doberman Pinschers of Cats” because of their fine coat and the elegantly outlined yet powerful feline physique. The body has a double coating of thick fur that’s rich and plush. Breeders and experts often compare the silky coat to a beaver’s or a seal’s.

If Squeakers is acting normally otherwise and doesn't seem to be having any respiratory distress, this may just be normal for her. If she hasn't had a checkup in a while, it would be a good idea to have her checked out, regardless, as a veterinarian can listen to her heart and lungs, and assess her general health and whether this breathing pattern is normal, or a potential problem. I hope that all goes well for her!