Thank you for your email. It would be best to have him examined by your veterinarian, yes - if he had any type of underlying heart problem that you weren't aware of, they stress of being restrained may have caused fluid to build up around his heart and lungs. They may want to take an x-ray to make sure that he is okay, but it isn't normal for him to still be breathing heavily and coughing 2 days after the event. I hope that he is okay.
If a cat’s resting respiratory rate exceeds 40 breaths per minute you should visit your Veterinarian; there are many causes for an increase in respiratory rate which may include infections, pain, heart disease, liver disease, parasites among many other conditions. Whilst you should keep an eye on her, I would still recommend visiting a Veterinarian sooner rather than later to be on the safe side. 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
The domestic short-haired and domestic long-haired cat types are not breeds, but terms used (with various spellings) in the cat fancy to describe mongrel cats of a general type, by coat length, that do not belong to a particular breed. Some registries permit them to be pedigreed and they have been used as foundation stock in the establishment of some breeds. They should not be confused with standardized breeds with similar names, such as British Shorthair and Oriental Longhair.