The twitching of the nerves in the dog's hind legs may be caused by long-term calcium deficiency, arthritis, leg injuries, or sequelae of canine distemper. It is best to take the dog to the pet hospital to check the cause before proceeding. Targeted treatment will be more effective. Pay attention to supplementing calcium for the dog, letting the dog get more sun, and taking the dog for appropriate exercise, so that the dog's bones will be healthier.