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 

There are many different options for analgesia in cats, however without knowing which medication was provided for pain relief I cannot give you an indication of how long it would be effective for as we have many different products on the market with different active ingredients, mechanisms of action and duration. A respiratory rate above 35 or 40 breaths per minute is expected as a result of discomfort or pain, but without examining Chester or knowing what was administered I cannot give you any specific information. Regards Dr Callum Turner DVM
My cat is recovering from having a tumor taken off of his neck. He is not thriving and today i found that he has blood in his urine. He is also breathing in short bursts. The doc said unless he seems very uncomfortable, it can wait till tomorrow, MOnday. I want the cat to see his usual vet, instead of taking him to emergency. What would you do? I don’t want him to suffer, so i gave him some pain meds.
My cat has feline viral rhinotracheitis. The vet has given him steroid shots as a temporary fix but it doesn’t help much. Today I came in my house and found him breathing very hard and labored. His respiratory rate is 120, yes 120. His ears are very warm and his third eyelids are covering half of both eyes. He won’t eat. He will not respond to me when I talk to him. He has been on my sofa asleep all day.
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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