A cat shouldn’t be breathing more than around 40 breaths per minute when at rest, if her breathing is above this rate then it may be indicative of something going on. An increase in breathing may be due to infections, heart disease, cancer, pleural effusion, allergies among other causes; given Smudge’s age, I would have your Veterinarian take a look at her to be on the safe side. Regards Dr Callum Turner DVM
Without examining Midnight it is difficult to give a diagnosis since lethargy and loss of appetite are vague symptoms common with many different conditions; infections, parasites (regardless of indoor or not), foreign objects, poisoning, spoiled food, injury (fell from somewhere) among many other causes may lead to these symptoms. You should ensure that Midnight is kept hydrated, but if there is no improvement you should visit your Veterinarian for an examination. Regards Dr Callum Turner DVM
There are various different causes for rapid breathing which may include infections, pain, heart disorders, dehydration among other causes; a cat’s respiration should be below 30 breaths per minute when at rest but if it is significantly above this rate at rest I would suggest visiting your Veterinarian for an examination to determine a cause. Regards Dr Callum Turner DVM