By 1965, British breeders expressed unhappiness over the abrupt change in the Russian Blue's shape and personality, and immediately began an effort to bring back the original Russian Blue. By breeding the Scandinavian cats, known for their good head type and vivid green eye color, with the British Russian Blues, a cat with a silver-blue coat color and graceful body style, the breeders finally achieved what they were looking for.
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
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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