Russian Blue cat feeding instructions:
1. Feed your cat at regular times and in fixed quantities. Just like humans, cats are prone to various gastrointestinal diseases if they don't eat regularly. Owners should provide their cats with food at regular times and in fixed quantities.
2. Food Restrictions. Never feed Russian Blue cats chocolate, onions, grapes, etc. Additionally, animal liver is high in Vitamin A, and excessive consumption can lead to Vitamin A poisoning in cats.
3. Controlling snacks. Too many snacks can not only make a British Shorthair cat picky about food, but some British Shorthairs may also get sick from eating too many snacks.
4. Provide your Russian Blue cat with a comfortable and warm cat bed, change its bedding regularly, and let its bed bask in the sun often.
5. Russian Blue cats don't really like going out and prefer staying at home. Taking them out suddenly might make them feel panicked. If you think your cat isn't getting enough exercise, you can play some games with them more often. 
How to choose a Blue Cat:
1. Observe the kittens. Spend a few minutes observing and looking for alert, interesting, and curious kittens.
2. Check the coat. Part the coat and carefully check for flea spots, as fleas can be a vector for scrub typhus.
3. Check the ears and eyes. The ears should be clean and free of earwax. The third eyelid, also known as the nictitating membrane, should not be longer than the eye and should not have any discharge.
4. Check the mouth. Inspect the inside of the blue cat's mouth, as there may be cracked teeth, gum disease, or cavities.
5. Before purchasing, confirm whether the kitten has been vaccinated.