A normal healthy cat will take 20-30 regular breaths per minute. The air travels into your cat’s lungs and is used to oxygenate the blood, which is then circulated throughout your cat’s vital organs. When a cat is suffering from rapid breathing, this breath rate increases and often becomes irregular, or shallow. This can often be an indication that your cat is not able to bring enough oxygen into the lungs to supply their body’s need. Rapid breathing is a symptom that can be caused by a number of illnesses or injuries. Since regular breathing is vital, if your cat is suffering from rapid breathing (also known as tachypnea) it is a serious and life threatening condition and you should seek immediate veterinary care.
Two days is still early days for treatment but you should start seeing some improvement in the next day or so, I would say to give it the weekend and if there is no improvement in Jinx’s condition you should return to your Veterinarian on Monday for another examination. Improvement in an animal's condition, especially with antibiotics, can be delayed in most cases so unless your Veterinarian said specifically ‘you’ll see improvement over the next 24 hours’ or something similar you should give it three or four days at least. 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