Cats that walk with a hunched back may be sick. When a cat's body lacks calcium, it will have a hunched back and walk unsteadily. At this time, the owner needs to replenish calcium in time to avoid skeletal dysplasia of the body. Furthermore, if a cat walks with its back hunched over, it may be that the cat is frightened and the things around it make the cat feel in danger, so this behavior occurs.