The reasons why cat hair becomes hard:

1. It may be that the kitten grows into an adult cat and sheds its fur and grows new hair. The new hair will Harder than before.

2. It may also be caused by cats’ normal seasonal hair shedding. Cats will change their hair in different seasons to adjust.

3. It may also be that the owner has not provided nutritional supplements to the cat, resulting in the cat’s hair not growing well.

4. It may also be that the cat’s body lacks certain trace elements, causing the hair to become hard.

5. It may also be caused by the owner not grooming the cat regularly and in a timely manner.

Solutions to hardened cat hair:

1. The owner can add some nutritious food supplements to the cat, which can be boiled chicken breast, beef, fish, etc. , it can also be some fruits and vegetables, etc.

2. The owner can also prepare some lecithin to feed the cat to promote hair growth and make the hair softer and shiny.

3. Owners also need to comb their cats' hair regularly. This is a job of combing and cleaning the body and hair, and it is also helpful for the cat's hair.

4. The owner can also take the cat to bask in the sun to promote hair growth, but it is not recommended to bathe the cat frequently.