Observing your British Shorthair blue and white cat's health involves looking at their overall demeanor, eye cleanliness, sleep patterns, and appetite. These are key indicators of their well-being.

Activity Levels and Responsiveness
A healthy cat is usually energetic and playful. They should be moving around, exploring, and interacting with their environment. If your cat is lethargic, spending most of its time in one spot, and doesn't vocalize much, it could be a sign of illness. Healthy cats also have quick reflexes. If your cat becomes slow to react or disinterested in play, this warrants a closer look into their health.
Eye Health
Healthy cat's eyes should be bright and clear. Excessive tearing or eye discharge, especially if it's consistent, is a cause for concern and can indicate an infection or other underlying health issues. While cats are generally good at self-grooming, regular grooming, including monthly baths, is still important. If your cat has eye discharge you can help them by wiping their eyes gently with a damp, warm cloth.
Sleep Patterns
A healthy cat generally sleeps soundly and deeply, and they aren't easily awakened. If a cat is restless, easily disturbed, or doesn't seem to be getting restful sleep, this can indicate discomfort or illness. It is essential to observe these changes in sleep patterns as they may be indicators of an underlying health problem.
Appetite
If you've had your cat for a while, you should have a good sense of how much they typically eat. A sudden loss of appetite or a significant change in eating habits should not be ignored. If your cat refuses to eat for several consecutive days, it's best to consult with a veterinarian. Changes in appetite are a common symptom for many illnesses in cats.
Other Things to Consider
Besides observing the above signs, regular vet check-ups, ensuring they have a balanced diet, keeping their litterbox clean and readily available, and providing them with a comfortable living environment is all very important in maintaining your British Shorthair’s overall health and well being. Don’t hesitate to contact your vet if you notice any changes to behavior or physical signs of health concerns.