If a cat barks as soon as the injection site is touched after the injection, it may be because it was frightened during the injection, or it may be that the injection has hit the middle of the fur layer and the dermis. You need to observe the cat for a day to see if there are other adverse reactions. If the cat has no other adverse reactions throughout the day, If this is the case, and the injection site is red and swollen, you can use a hot towel to apply heat to the injection site. If it does not improve for three consecutive days, it is best to take the cat to the pet hospital for examination.