The yellow hair on the chest of blue cats may be caused by improper diet, malnutrition, poor care and other reasons. First, improve the cat’s diet and feed it some lighter food. Do not feed the cat food that is too oily or salty. , and at the same time, the cat should be supplemented with protein, vitamins and other nutrients. You can also feed the cat some lecithin appropriately to repair damaged hair. When bathing the cat, you should use cat-specific shower gel instead of human shower gel.