Tickling a cat's chest may be to provide comfort or help the cat relax, but this is not a behavior cats like. Cats' body language is often subtle, so if your cat doesn't show a favorable response when being scratched, this may be an uncomfortable behavior for your cat.
A cat's body language can be expressed through its tail, ears, body and mouth. If your cat has a raised tail, ears turned back, body tightening, or mouth open, these may be signs that your cat is uncomfortable or fearful. Therefore, in order to ensure the comfort and happiness of your cat, it is best not to scratch the cat's chest, but to observe the cat's reaction and interact with it according to the cat's preferences.
