Regarding the difficulty of detecting illnesses in cats
Cats adapt to their environment, which is why house cats are less prone to become ill than cats who spend a lot of time outside the house. In spite of this, house cats do not usually show their weaknesses and hide their illnesses. That is why we recommend that you observe your cat's behaviour closely, in order to detect any symptom that will enable you to act in good time.
Some of these symptoms are simple daily routines that your cat stops doing, such as stopping grooming, or loss of appetite; it can also lick or scratch itself excessively, or lose weight. Other symptoms can be easier to detect, such as coughing, sneezing or nasal discharge, bad breath, drooling, loss of balance, diarrhoea, constipation, and frequent vomiting or urinary problems, but these can also go unnoticed at any time. That is why it is very important to be observant of your cat and not let it fool you. Moreover, it is of utmost importance that if you detect any of these symptoms, you must absolutely go to the veterinarian in order to stop this in time and have a fit cat as before. Because if your cat is healthy, it is happy.