There may be many reasons for cats to hunch. Here are some possible explanations: 1. Physiological structure: Cats have different bone structures from humans. Their spines are more flexible than humans, which allows them to maintain their posture while running and jumping. balance. Therefore, the cat's back may show a certain arc during movement, which is not a sign of disease. 2. Hunting instinct: Cats will arch their backs when approaching prey. This can increase their explosive power and absorb impact. It is also a kind of body language to express their mood.

3. Age factor: As cats age, they may develop some health problems, such as arthritis. These problems May cause abnormalities on the cat's back.

4. Injury: If the cat is injured, especially the spine or legs, it may cause the cat's back to be deformed.