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
The Russian blue is a sweet-tempered, loyal cat who will follow her owner everywhere, so don't be surprised if she greets you at the front door! While she has a tendency to attach to one pet parent in particular, she demonstrates affection with her whole family and demands it in return. It's said that Russian blues train their owners rather than the owners training them, a legend that's been proven true time and again.