What should I do if my puppy's back legs are shaking?

Shaking back legs in a puppy may be caused by factors such as calcium deficiency, leg injuries, or cold weather. Here are some possible reasons and solutions:

Calcium deficiency: If the puppy's diet is monotonous or lacking in nutrients, it may develop weakness and shaking in its back legs. To address this, provide the puppy with a balanced and nourishing diet, including calcium-rich foods such as shrimp shells and seaweed. You can also consider supplementing your dog with calcium supplements and encourage them to spend more time outdoors to absorb vitamin D, which helps with calcium absorption.
Leg injuries: Puppies are naturally active, and if they suddenly develop shaking back legs after playing outside, it may be due to a leg injury. In this case, carefully examine the puppy's legs for any visible wounds or abnormalities. If there are wounds, stop the bleeding immediately, rinse the wound with physiological saline, and apply an antiseptic agent. If the leg is fractured, take the puppy to a veterinarian to have X-rays taken to determine the severity of the fracture, and then proceed with external or internal fixation treatment.
Cold weather: In cold winter weather, when a puppy's limbs touch cold surfaces or lies directly on the ground, it may involuntarily shiver due to the cold. To resolve this, simply ensure the puppy's warmth by providing a warm bed and monitoring whether it continues to shake. If the shaking stops, the puppy should be fine.

Remember to always consult a veterinarian if you are unsure about the cause of your puppy's shaking back legs or if the symptoms persist.