Causes and methods of liberating stiff tails of cats with folded ears:

1. Bone abnormalities or diseases: Deformities or diseases of the tail bones of cats with folded ears may cause tail stiffness. This can be due to things like genetic defects, trauma, or disease. If it is caused by a genetic defect, the cat may be at risk for other genetic diseases. Timely examination and treatment should be carried out. If it is caused by a genetic problem, avoid breeding it.

2. Muscle disease: Tail muscle disease in folded-eared cats may cause tail stiffness. This can be due to things like malnutrition, infection, or muscle disease. Make sure your cat's food contains enough nutrients, including protein, vitamins and minerals, to prevent the occurrence of muscle diseases.

3. Spine problems: Spine problems in folded-eared cats may cause a stiff tail. This can be due to things like spinal injury, stress, deformation, or disease. Check your cat's spine and tail regularly to detect and treat possible problems. Fold-eared cats should maintain an appropriate amount of exercise, but they also need sufficient rest time to avoid muscle disease or spinal problems caused by over-fatigue and over-exercise.