It is difficult to say whether this is something pathological or not since the rapid breathing for a short period of time may be due to smelling something (looks like breathing with the chest movements) or another cause; if there are no other symptoms and these ‘episodes’ only last a couple of seconds I would keep an eye on things for now and bring it up with your Veterinarian at Salem’s next checkup. Regards Dr Callum Turner DVM
A British cat fancier named Mrs. Carew-Cox began importing the cats in 1890 and bred and showed them through the turn of the century. She described them as having short, silvery fur, large ears, wide-set eyes and lean faces, with sweet, intelligent personalities—in short, much the same as the Russian Blue of today. In 1912, the cats were well enough established that they could be shown in a class of their own instead of being lumped together with other blue cats.
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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