It is normal for cats to be inactive and sleepy after receiving the vaccine. Generally, after receiving the vaccine, cats will have symptoms such as poor energy, loss of appetite, low fever, lethargy, etc., and will recover in about two days. If it does not recover within two days, you need to take the cat to the hospital for examination to avoid adverse reactions. The resistance of cats after injection is relatively low, so pay more attention not to let the cat catch a cold, and do not give the cat random food.